Space weather

Solar wind speed Solar wind magnetic fields Noon 10.7cm radio flux
Bt Bz

Update

Update

Update
CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-22 05.00 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2668
Begin Time: 2017 Sep 15 0830 UTC
Yesterday Maximum 2MeV Flux: 30386 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-21 05.00 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2667
Begin Time: 2017 Sep 15 0830 UTC
Yesterday Maximum 2MeV Flux: 33761 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-20 05.05 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2666
Begin Time: 2017 Sep 15 0830 UTC
Yesterday Maximum 2MeV Flux: 34880 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-20 03.53 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Sep 20 0352 UTC
Valid To: 2017 Sep 20 1200 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-19 05.00 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2665
Begin Time: 2017 Sep 15 0830 UTC
Yesterday Maximum 2MeV Flux: 31067 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-18 23.11 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3324
Valid From: 2017 Sep 14 1310 UTC
Now Valid Until: 2017 Sep 19 0600 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-18 08.56 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 18 0856 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-18 08.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3323
Valid From: 2017 Sep 14 1310 UTC
Now Valid Until: 2017 Sep 18 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-18 08.55 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1407
Valid From: 2017 Sep 18 0235 UTC
Now Valid Until: 2017 Sep 18 1500 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-18 06.16 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2664
Begin Time: 2017 Sep 15 0830 UTC
Yesterday Maximum 2MeV Flux: 46263 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-18 02.38 UTC
Geomagnetic K-index of 5 expected
Valid From: 2017 Sep 18 0235 UTC
Valid To: 2017 Sep 18 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-18 02.38 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3322
Valid From: 2017 Sep 14 1310 UTC
Now Valid Until: 2017 Sep 18 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-17 23.43 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3321
Valid From: 2017 Sep 14 1310 UTC
Now Valid Until: 2017 Sep 18 0600 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-17 11.47 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3320
Valid From: 2017 Sep 14 1310 UTC
Now Valid Until: 2017 Sep 17 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-17 05.00 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2663
Begin Time: 2017 Sep 15 0830 UTC
Yesterday Maximum 2MeV Flux: 22886 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-16 15.17 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3319
Valid From: 2017 Sep 14 1310 UTC
Now Valid Until: 2017 Sep 17 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-16 14.58 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1405
Valid From: 2017 Sep 14 1445 UTC
Now Valid Until: 2017 Sep 17 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-16 08.37 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1404
Valid From: 2017 Sep 14 1445 UTC
Now Valid Until: 2017 Sep 16 1500 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-Index of 6 expected
Issued: 2017-09-16 05.33 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2017 Sep 16 0532 UTC
Valid To: 2017 Sep 16 0900 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 6
Issued: 2017-09-16 05.33 UTC
Geomagnetic K-index of 6
Threshold Reached: 2017 Sep 16 0533 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-16 05.08 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2662
Begin Time: 2017 Sep 15 0830 UTC
Yesterday Maximum 2MeV Flux: 32096 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-16 04.57 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 16 0455 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-16 02.33 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 16 0231 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-15 23.43 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 15 2342 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-15 23.21 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1403
Valid From: 2017 Sep 14 1445 UTC
Now Valid Until: 2017 Sep 16 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-15 23.21 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3318
Valid From: 2017 Sep 14 1310 UTC
Now Valid Until: 2017 Sep 16 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WATCH
Geomagnetic Storm Category G1 Predicted
Issued: 2017-09-15 21.24 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Sep 16: G1 (Minor) Sep 17: None (Below G1) Sep 18: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-15 19.27 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 15 1926 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-15 14.50 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1402
Valid From: 2017 Sep 14 1445 UTC
Now Valid Until: 2017 Sep 15 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-15 14.50 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3317
Valid From: 2017 Sep 14 1310 UTC
Now Valid Until: 2017 Sep 16 0600 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-15 09.01 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 15 0859 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-15 08.48 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1401
Valid From: 2017 Sep 14 1445 UTC
Now Valid Until: 2017 Sep 15 1500 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-15 08.48 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3316
Valid From: 2017 Sep 14 1310 UTC
Now Valid Until: 2017 Sep 15 1800 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-15 08.46 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Sep 15 0830 UTC
Station: GOES13


Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 6
Issued: 2017-09-15 02.44 UTC
Geomagnetic K-index of 6
Threshold Reached: 2017 Sep 15 0240 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

EXTENDED WARNING
Geomagnetic K-Index of 6 expected
Issued: 2017-09-15 02.44 UTC
Geomagnetic K-Index of 6 expected
Extension to Serial Number: 401
Valid From: 2017 Sep 14 1555 UTC
Now Valid Until: 2017 Sep 15 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-15 02.44 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3315
Valid From: 2017 Sep 14 1310 UTC
Now Valid Until: 2017 Sep 15 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-15 02.44 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1400
Valid From: 2017 Sep 14 1445 UTC
Now Valid Until: 2017 Sep 15 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

SUMMARY
Proton Event 10MeV Integral Flux exceeded 10pfu
Issued: 2017-09-15 02.44 UTC
Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2017 Sep 10 1645 UTC
Maximum Time: 2017 Sep 10 1845 UTC
End Time: 2017 Sep 15 1725 UTC
Maximum 10MeV Flux: 1038 pfu
NOAA Scale: S1 - Minor

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-15 00.42 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 15 0036 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-Index of 6 expected
Issued: 2017-09-14 20.57 UTC
Geomagnetic K-Index of 6 expected
Extension to Serial Number: 400
Valid From: 2017 Sep 14 1555 UTC
Now Valid Until: 2017 Sep 15 0300 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-14 20.33 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 14 2032 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-14 20.23 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1399
Valid From: 2017 Sep 14 1445 UTC
Now Valid Until: 2017 Sep 15 0300 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 6
Issued: 2017-09-14 18.02 UTC
Geomagnetic K-index of 6
Threshold Reached: 2017 Sep 14 1759 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

WARNING
Geomagnetic K-Index of 6 expected
Issued: 2017-09-14 15.53 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2017 Sep 14 1555 UTC
Valid To: 2017 Sep 14 2100 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-14 15.46 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 14 1543 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 4
Issued: 2017-09-14 15.03 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Sep 14 1459 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-14 14.42 UTC
Geomagnetic K-index of 5 expected
Valid From: 2017 Sep 14 1445 UTC
Valid To: 2017 Sep 14 2100 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-14 13.11 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Sep 14 1310 UTC
Valid To: 2017 Sep 15 0600 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

SUMMARY
Proton Event 100MeV Integral Flux exceeded 1pfu
Issued: 2017-09-14 00.02 UTC
Proton Event 100MeV Integral Flux exceeded 1pfu
Begin Time: 2017 Sep 10 1625 UTC
Maximum Time: 2017 Sep 10 2215 UTC
End Time: 2017 Sep 11 2205 UTC
Maximum 100MeV Flux: 68 pfu

EXTENDED WARNING
Proton 10MeV Integral Flux above 10pfu expected
Issued: 2017-09-13 22.11 UTC
Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 472
Valid From: 2017 Sep 10 1630 UTC
Now Valid Until: 2017 Sep 14 2359 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S1 - Minor

Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience small, increased radiation exposures.
Spacecraft - Infrequent single-event upsets to satellites are possible.
Radio - Small effects on polar HF (high frequency) propagation resulting in fades at lower frequencies.

SUMMARY
Proton Event 10MeV Integral Flux exceeded 100pfu
Issued: 2017-09-13 18.10 UTC
Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2017 Sep 10 1705 UTC
Maximum Time: 2017 Sep 10 1845 UTC
End Time: 2017 Sep 12 2135 UTC
Maximum 10MeV Flux: 1038 pfu
NOAA Scale: S3 - Strong

EXTENDED WARNING
Proton 100MeV Integral Flux above 1pfu expected
Issued: 2017-09-13 11.45 UTC
Proton 100MeV Integral Flux above 1pfu expected
Extension to Serial Number: 85
Valid From: 2017 Sep 10 1630 UTC
Now Valid Until: 2017 Sep 13 2359 UTC
Warning Condition: Persistence

Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.

WARNING
Geomagnetic K-Index of 6 expected
Issued: 2017-09-13 01.07 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2017 Sep 13 0105 UTC
Valid To: 2017 Sep 13 0600 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-13 01.07 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1397
Valid From: 2017 Sep 12 2031 UTC
Now Valid Until: 2017 Sep 13 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-13 00.43 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 12 0040 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-12 23.40 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 12 2340 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 4
Issued: 2017-09-12 21.12 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Sep 12 2059 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WATCH
Geomagnetic Storm Category G2 Predicted
Issued: 2017-09-12 20.57 UTC
Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Sep 13: G2 (Moderate) Sep 14: G1 (Minor) Sep 15: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

EXTENDED WARNING
Proton 100MeV Integral Flux above 1pfu expected
Issued: 2017-09-12 20.49 UTC
Proton 100MeV Integral Flux above 1pfu expected
Extension to Serial Number: 84
Valid From: 2017 Sep 10 1630 UTC
Now Valid Until: 2017 Sep 13 1200 UTC
Warning Condition: Persistence

Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.

EXTENDED WARNING
Proton 10MeV Integral Flux above 10pfu expected
Issued: 2017-09-12 20.48 UTC
Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 471
Valid From: 2017 Sep 10 1630 UTC
Now Valid Until: 2017 Sep 13 2359 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S2 - Moderate

Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience small, increased radiation exposures.
Spacecraft - Infrequent single-event upsets to satellites are possible.
Radio - Small effects on polar HF (high frequency) propagation resulting in fades at lower frequencies.

WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-12 20.33 UTC
Geomagnetic K-index of 5 expected
Valid From: 2017 Sep 12 2031 UTC
Valid To: 2017 Sep 13 0300 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-12 20.32 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3313
Valid From: 2017 Sep 12 1942 UTC
Now Valid Until: 2017 Sep 13 1200 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Type II Radio Emission
Issued: 2017-09-12 19.49 UTC
Type II Radio Emission
Begin Time: 2017 Sep 12 1912 UTC
Estimated Velocity: 844 km/s

Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-12 19.43 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Sep 12 1942 UTC
Valid To: 2017 Sep 13 0300 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-12 10.16 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2660
Begin Time: 2017 Sep 08 1935 UTC
Yesterday Maximum 2MeV Flux: 5361 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Type II Radio Emission
Issued: 2017-09-12 08.26 UTC
Type II Radio Emission
Begin Time: 2017 Sep 12 0729 UTC
Estimated Velocity: 909 km/s

Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

SUMMARY
10cm Radio Burst
Issued: 2017-09-12 08.26 UTC
10cm Radio Burst
Begin Time: 2017 Sep 12 0726 UTC
Maximum Time: 2017 Sep 12 0727 UTC
End Time: 2017 Sep 12 0728 UTC
Duration: 2 minutes
Peak Flux: 110 sfu
Latest Penticton Noon Flux: 80 sfu

Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

EXTENDED WARNING
Proton 10MeV Integral Flux above 10pfu expected
Issued: 2017-09-11 19.41 UTC
Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 470
Valid From: 2017 Sep 10 1630 UTC
Now Valid Until: 2017 Sep 12 2359 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S2 - Moderate

Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience small, increased radiation exposures.
Spacecraft - Infrequent single-event upsets to satellites are possible.
Radio - Small effects on polar HF (high frequency) propagation resulting in fades at lower frequencies.

EXTENDED WARNING
Proton 100MeV Integral Flux above 1pfu expected
Issued: 2017-09-11 19.40 UTC
Proton 100MeV Integral Flux above 1pfu expected
Extension to Serial Number: 83
Valid From: 2017 Sep 10 1630 UTC
Now Valid Until: 2017 Sep 12 2359 UTC
Warning Condition: Persistence

Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.

WATCH
Geomagnetic Storm Category G2 Predicted
Issued: 2017-09-11 19.21 UTC
Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Sep 12: None (Below G1) Sep 13: G2 (Moderate) Sep 14: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

WATCH
Geomagnetic Storm Category G2 Predicted
Issued: 2017-09-11 11.47 UTC
Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Sep 11: None (Below G1) Sep 12: None (Below G1) Sep 13: G2 (Moderate)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-11 05.21 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2659
Begin Time: 2017 Sep 08 1935 UTC
Yesterday Maximum 2MeV Flux: 7875 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 4
Issued: 2017-09-11 01.10 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Sep 10 2359 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Proton 100MeV Integral Flux above 1pfu expected
Issued: 2017-09-10 23.42 UTC
Proton 100MeV Integral Flux above 1pfu expected
Extension to Serial Number: 82
Valid From: 2017 Sep 10 1630 UTC
Now Valid Until: 2017 Sep 11 2359 UTC
Warning Condition: Persistence

Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.

WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-10 23.41 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Sep 10 2340 UTC
Valid To: 2017 Sep 11 1800 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Proton Event 10MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-10 18.46 UTC
Proton Event 10MeV Integral Flux exceeded 1000pfu
Begin Time: 2017 Sep 10 1840 UTC
NOAA Scale: S3 - Strong

Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience increasing radiation exposures. Astronauts on EVA (extra-vehicular activity) are exposed to elevated radiation levels.
Spacecraft - Single-event upsets to satellite operations, noise in imaging systems, and slight reduction of efficiency in solar panels are likely.
Radio - Degraded or episodically blacked-out polar HF (high frequency) radio propagation.

SUMMARY
X-ray Event exceeded X1
Issued: 2017-09-10 18.13 UTC
X-ray Event exceeded X1
Begin Time: 2017 Sep 10 1535 UTC
Maximum Time: 2017 Sep 10 1606 UTC
End Time: 2017 Sep 10 1631 UTC
X-ray Class: X8.2
Location: S09W90
NOAA Scale: R3 - Strong

Comment: Flare originated from Region 2673, currently located just behind the west limb.

Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

SUMMARY
10cm Radio Burst
Issued: 2017-09-10 17.22 UTC
10cm Radio Burst
Begin Time: 2017 Sep 10 1550 UTC
Maximum Time: 2017 Sep 10 1554 UTC
End Time: 2017 Sep 10 1706 UTC
Duration: 76 minutes
Peak Flux: 1900 sfu
Latest Penticton Noon Flux: 107 sfu

Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

EXTENDED WARNING
Proton 10MeV Integral Flux above 10pfu expected
Issued: 2017-09-10 17.20 UTC
Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 469
Valid From: 2017 Sep 10 1630 UTC
Now Valid Until: 2017 Sep 11 2359 UTC
Warning Condition: Persistence
Predicted NOAA Scale: S3 - Strong

Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience small, increased radiation exposures.
Spacecraft - Infrequent single-event upsets to satellites are possible.
Radio - Small effects on polar HF (high frequency) propagation resulting in fades at lower frequencies.

ALERT
Proton Event 10MeV Integral Flux exceeded 100pfu
Issued: 2017-09-10 17.11 UTC
Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2017 Sep 10 1705 UTC
NOAA Scale: S2 - Moderate

Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience small, increased radiation exposures.
Spacecraft - Infrequent single-event upsets to satellites are possible.
Radio - Small effects on polar HF (high frequency) propagation resulting in fades at lower frequencies.

ALERT
Proton Event 10MeV Integral Flux exceeded 10pfu
Issued: 2017-09-10 17.01 UTC
Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2017 Sep 10 1645 UTC
NOAA Scale: S1 - Minor

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

ALERT
Type IV Radio Emission
Issued: 2017-09-10 16.47 UTC
Type IV Radio Emission
Begin Time: 2017 Sep 10 1608 UTC

Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

ALERT
Type II Radio Emission
Issued: 2017-09-10 16.47 UTC
Type II Radio Emission
Begin Time: 2017 Sep 10 1608 UTC
Estimated Velocity: 928 km/s

Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

ALERT
Proton Event 100MeV Integral Flux exceeded 1pfu
Issued: 2017-09-10 16.40 UTC
Proton Event 100MeV Integral Flux exceeded 1pfu
Begin Time: 2017 Sep 10 1625 UTC

Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.

WARNING
Proton 10MeV Integral Flux above 10pfu expected
Issued: 2017-09-10 16.32 UTC
Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2017 Sep 10 1630 UTC
Valid To: 2017 Sep 10 2359 UTC
Warning Condition: Onset
Predicted NOAA Scale: S2 - Moderate

Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience small, increased radiation exposures.
Spacecraft - Infrequent single-event upsets to satellites are possible.
Radio - Small effects on polar HF (high frequency) propagation resulting in fades at lower frequencies.

WARNING
Proton 100MeV Integral Flux above 1pfu expected
Issued: 2017-09-10 16.32 UTC
Proton 100MeV Integral Flux above 1pfu expected
Valid From: 2017 Sep 10 1630 UTC
Valid To: 2017 Sep 10 2359 UTC
Warning Condition: Onset

Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.

ALERT
X-Ray Flux exceeded M5
Issued: 2017-09-10 15.58 UTC
X-Ray Flux exceeded M5
Threshold Reached: 2017 Sep 10 1553 UTC
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-10 05.01 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2658
Begin Time: 2017 Sep 08 1935 UTC
Yesterday Maximum 2MeV Flux: 6358 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Type II Radio Emission
Issued: 2017-09-09 23.54 UTC
Type II Radio Emission
Begin Time: 2017 Sep 09 2252 UTC
Estimated Velocity: 939 km/s

Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

SUMMARY
10cm Radio Burst
Issued: 2017-09-09 23.21 UTC
10cm Radio Burst
Begin Time: 2017 Sep 09 2244 UTC
Maximum Time: 2017 Sep 09 2255 UTC
End Time: 2017 Sep 09 2308 UTC
Duration: 24 minutes
Peak Flux: 450 sfu
Latest Penticton Noon Flux: 107 sfu

Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

CANCEL WATCH
Geomagnetic Storm Category G2 Predicted
Issued: 2017-09-09 15.07 UTC
Geomagnetic Storm Category G2 Predicted
Cancel Serial Number: 164
Original Issue Time: 2017 Sep 08 2049 UTC

Comment: Conditions no longer warrant this Watch.

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

SUMMARY
Proton Event 10MeV Integral Flux exceeded 10pfu
Issued: 2017-09-09 14.27 UTC
Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2017 Sep 05 0040 UTC
Maximum Time: 2017 Sep 08 0035 UTC
End Time: 2017 Sep 09 0005 UTC
Maximum 10MeV Flux: 844 pfu
NOAA Scale: S2 - Moderate

SUMMARY
Proton Event 10MeV Integral Flux exceeded 100pfu
Issued: 2017-09-09 14.27 UTC
Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2017 Sep 05 0715 UTC
Maximum Time: 2017 Sep 08 0035 UTC
End Time: 2017 Sep 08 0620 UTC
Maximum 10MeV Flux: 844 pfu
NOAA Scale: S2 - Moderate

CANCEL WARNING
Proton 10MeV Integral Flux above 10pfu expected
Issued: 2017-09-09 14.27 UTC
Proton 10MeV Integral Flux above 10pfu expected
Cancel Serial Number: 467
Original Issue Time: 2017 Sep 05 0030 UTC

Comment: Conditions for this Warning are no longer present.

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-09 05.01 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2657
Begin Time: 2017 Sep 08 1935 UTC
Yesterday Maximum 2MeV Flux: 2639 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-09 00.04 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 08 2359 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-Index of 6 expected
Issued: 2017-09-08 20.49 UTC
Geomagnetic K-Index of 6 expected
Extension to Serial Number: 397
Valid From: 2017 Sep 07 2255 UTC
Now Valid Until: 2017 Sep 09 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

WATCH
Geomagnetic Storm Category G2 Predicted
Issued: 2017-09-08 20.49 UTC
Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Sep 09: G2 (Moderate) Sep 10: None (Below G1) Sep 11: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-08 20.49 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1395
Valid From: 2017 Sep 07 0003 UTC
Now Valid Until: 2017 Sep 09 1500 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Proton 10MeV Integral Flux above 10pfu expected
Issued: 2017-09-08 20.49 UTC
Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 466
Valid From: 2017 Sep 05 0030 UTC
Now Valid Until: 2017 Sep 09 2359 UTC
Warning Condition: persistence
Predicted NOAA Scale: S1 - Minor

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-08 20.48 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3310
Valid From: 2017 Sep 06 2330 UTC
Now Valid Until: 2017 Sep 09 2359 UTC
Warning Condition: persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 6
Issued: 2017-09-08 20.18 UTC
Geomagnetic K-index of 6
Threshold Reached: 2017 Sep 08 2014 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-08 19.54 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Sep 08 1935 UTC
Station: GOES13


Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-08 18.21 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 08 1819 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 7
Issued: 2017-09-08 16.06 UTC
Geomagnetic K-index of 7
Threshold Reached: 2017 Sep 08 1604 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

ALERT
Geomagnetic K-index of 6
Issued: 2017-09-08 15.44 UTC
Geomagnetic K-index of 6
Threshold Reached: 2017 Sep 08 1542 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-08 15.17 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 08 1514 UTC
Synoptic Period: 1500-1800 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 7 or greater expected
Issued: 2017-09-08 14.39 UTC
Geomagnetic K-index of 7 or greater expected
Extension to Serial Number: 71
Valid From: 2017 Sep 07 2300 UTC
Now Valid Until: 2017 Sep 08 2100 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

EXTENDED WARNING
Geomagnetic K-Index of 6 expected
Issued: 2017-09-08 13.06 UTC
Geomagnetic K-Index of 6 expected
Extension to Serial Number: 396
Valid From: 2017 Sep 07 2255 UTC
Now Valid Until: 2017 Sep 08 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 8
Issued: 2017-09-08 13.06 UTC
Geomagnetic K-index of 8
Threshold Reached: 2017 Sep 08 1304 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G4 - Severe

Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.

ALERT
Geomagnetic K-index of 7
Issued: 2017-09-08 12.33 UTC
Geomagnetic K-index of 7
Threshold Reached: 2017 Sep 08 1231 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

ALERT
Geomagnetic K-index of 6
Issued: 2017-09-08 12.27 UTC
Geomagnetic K-index of 6
Threshold Reached: 2017 Sep 08 1224 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-08 12.20 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 08 1217 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-08 12.01 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 08 1159 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

SUMMARY
X-ray Event exceeded M5
Issued: 2017-09-08 08.59 UTC
X-ray Event exceeded M5
Begin Time: 2017 Sep 08 0740 UTC
Maximum Time: 2017 Sep 08 0749 UTC
End Time: 2017 Sep 08 0758 UTC
X-ray Class: M8.1
Optical Class: 2b
Location: S10W58
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

ALERT
X-Ray Flux exceeded M5
Issued: 2017-09-08 07.47 UTC
X-Ray Flux exceeded M5
Threshold Reached: 2017 Sep 08 0746 UTC
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

SUMMARY
10cm Radio Burst
Issued: 2017-09-08 06.16 UTC
10cm Radio Burst
Begin Time: 2017 Sep 08 0533 UTC
Maximum Time: 2017 Sep 08 0539 UTC
End Time: 2017 Sep 08 0544 UTC
Duration: 11 minutes
Peak Flux: 350 sfu
Latest Penticton Noon Flux: 129 sfu

Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

EXTENDED WARNING
Geomagnetic K-Index of 6 expected
Issued: 2017-09-08 05.37 UTC
Geomagnetic K-Index of 6 expected
Extension to Serial Number: 395
Valid From: 2017 Sep 07 2255 UTC
Now Valid Until: 2017 Sep 08 1500 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-08 05.37 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1394
Valid From: 2017 Sep 07 0003 UTC
Now Valid Until: 2017 Sep 08 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 7 or greater expected
Issued: 2017-09-08 05.37 UTC
Geomagnetic K-index of 7 or greater expected
Extension to Serial Number: 70
Valid From: 2017 Sep 07 2300 UTC
Now Valid Until: 2017 Sep 08 1500 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

EXTENDED WARNING
Proton 10MeV Integral Flux above 10pfu expected
Issued: 2017-09-08 05.37 UTC
Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 465
Valid From: 2017 Sep 05 0030 UTC
Now Valid Until: 2017 Sep 08 2359 UTC
Warning Condition: persistence
Predicted NOAA Scale: S2 - Moderate

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-08 05.33 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3309
Valid From: 2017 Sep 06 2330 UTC
Now Valid Until: 2017 Sep 08 2359 UTC
Warning Condition: persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-08 04.52 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 08 0452 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 8
Issued: 2017-09-08 01.51 UTC
Geomagnetic K-index of 8
Threshold Reached: 2017 Sep 08 0151 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G4 - Severe

Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.

ALERT
Geomagnetic K-index of 7
Issued: 2017-09-08 01.16 UTC
Geomagnetic K-index of 7
Threshold Reached: 2017 Sep 08 0116 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

ALERT
Geomagnetic K-index of 6
Issued: 2017-09-08 00.28 UTC
Geomagnetic K-index of 6
Threshold Reached: 2017 Sep 08 0027 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-08 00.22 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 08 0022 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 8
Issued: 2017-09-07 23.50 UTC
Geomagnetic K-index of 8
Threshold Reached: 2017 Sep 07 2350 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G4 - Severe

Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify.
Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.

ALERT
Geomagnetic K-index of 7
Issued: 2017-09-07 23.25 UTC
Geomagnetic K-index of 7
Threshold Reached: 2017 Sep 07 2325 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G3 - Strong

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

SUMMARY
Geomagnetic Sudden Impulse
Issued: 2017-09-07 23.09 UTC
Geomagnetic Sudden Impulse
Observed: 2017 Sep 07 2304 UTC
Deviation: 70 nT
Station: FRD

ALERT
Geomagnetic K-index of 6
Issued: 2017-09-07 23.06 UTC
Geomagnetic K-index of 6
Threshold Reached: 2017 Sep 07 2302 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-07 22.57 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 07 2256 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 7 or greater expected
Issued: 2017-09-07 22.57 UTC
Geomagnetic K-index of 7 or greater expected
Valid From: 2017 Sep 07 2300 UTC
Valid To: 2017 Sep 08 0600 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater - Strong to Extreme

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

WARNING
Geomagnetic K-Index of 6 expected
Issued: 2017-09-07 22.44 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2017 Sep 07 2255 UTC
Valid To: 2017 Sep 08 0600 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

WARNING
Geomagnetic Sudden Impulse expected
Issued: 2017-09-07 22.42 UTC
Geomagnetic Sudden Impulse expected
Valid From: 2017 Sep 07 2255 UTC
Valid To: 2017 Sep 07 2330 UTC
IP Shock Passage Observed: 2017 Sep 07 2229 UTC

ALERT
Type II Radio Emission
Issued: 2017-09-07 19.12 UTC
Type II Radio Emission
Begin Time: 2017 Sep 07 1831 UTC
Estimated Velocity: 505 km/s

Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

SUMMARY
10cm Radio Burst
Issued: 2017-09-07 15.28 UTC
10cm Radio Burst
Begin Time: 2017 Sep 07 1446 UTC
Maximum Time: 2017 Sep 07 1448 UTC
End Time: 2017 Sep 07 1454 UTC
Duration: 8 minutes
Peak Flux: 690 sfu
Latest Penticton Noon Flux: 133 sfu

Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

SUMMARY
X-ray Event exceeded X1
Issued: 2017-09-07 15.11 UTC
X-ray Event exceeded X1
Begin Time: 2017 Sep 07 1420 UTC
Maximum Time: 2017 Sep 07 1436 UTC
End Time: 2017 Sep 07 1455 UTC
X-ray Class: X1.3
Optical Class: 2b
Location: S09W50
NOAA Scale: R3 - Strong

Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

SUMMARY
10cm Radio Burst
Issued: 2017-09-07 14.53 UTC
10cm Radio Burst
Begin Time: 2017 Sep 07 1434 UTC
Maximum Time: 2017 Sep 07 1435 UTC
End Time: 2017 Sep 07 1441 UTC
Duration: 7 minutes
Peak Flux: 1600 sfu
Latest Penticton Noon Flux: 133 sfu

Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

ALERT
X-Ray Flux exceeded M5
Issued: 2017-09-07 14.35 UTC
X-Ray Flux exceeded M5
Threshold Reached: 2017 Sep 07 1433 UTC
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-07 14.26 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3308
Valid From: 2017 Sep 06 2330 UTC
Now Valid Until: 2017 Sep 08 0600 UTC
Warning Condition: persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-07 14.26 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1393
Valid From: 2017 Sep 07 0003 UTC
Now Valid Until: 2017 Sep 08 0600 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Type II Radio Emission
Issued: 2017-09-07 14.21 UTC
Type II Radio Emission
Begin Time: 2017 Sep 07 1345 UTC
Estimated Velocity: 602 km/s

Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

ALERT
Type IV Radio Emission
Issued: 2017-09-07 11.23 UTC
Type IV Radio Emission
Begin Time: 2017 Sep 07 1035 UTC

Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

SUMMARY
10cm Radio Burst
Issued: 2017-09-07 10.33 UTC
10cm Radio Burst
Begin Time: 2017 Sep 07 1014 UTC
Maximum Time: 2017 Sep 07 1015 UTC
End Time: 2017 Sep 07 1016 UTC
Duration: 2 minutes
Peak Flux: 810 sfu
Latest Penticton Noon Flux: 133 sfu

Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

SUMMARY
X-ray Event exceeded M5
Issued: 2017-09-07 10.29 UTC
X-ray Event exceeded M5
Begin Time: 2017 Sep 07 1013 UTC
Maximum Time: 2017 Sep 07 1015 UTC
End Time: 2017 Sep 07 1020 UTC
X-ray Class: M7.3
Location: S08W47
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

ALERT
X-Ray Flux exceeded M5
Issued: 2017-09-07 10.18 UTC
X-Ray Flux exceeded M5
Threshold Reached: 2017 Sep 07 1015 UTC
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

ALERT
Type IV Radio Emission
Issued: 2017-09-07 10.16 UTC
Type IV Radio Emission
Begin Time: 2017 Sep 07 0954 UTC

Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

SUMMARY
10cm Radio Burst
Issued: 2017-09-07 10.08 UTC
10cm Radio Burst
Begin Time: 2017 Sep 07 0953 UTC
Maximum Time: 2017 Sep 07 0953 UTC
End Time: 2017 Sep 07 0954 UTC
Duration: 1 minutes
Peak Flux: 260 sfu
Latest Penticton Noon Flux: 133 sfu

Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-07 09.02 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3307
Valid From: 2017 Sep 06 2330 UTC
Now Valid Until: 2017 Sep 07 1800 UTC
Warning Condition: persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-07 08.57 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1392
Valid From: 2017 Sep 07 0003 UTC
Now Valid Until: 2017 Sep 07 1500 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-07 05.01 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2655
Begin Time: 2017 Sep 01 1350 UTC
Yesterday Maximum 2MeV Flux: 7224 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-07 00.02 UTC
Geomagnetic K-index of 5 expected
Valid From: 2017 Sep 07 0003 UTC
Valid To: 2017 Sep 07 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

SUMMARY
Geomagnetic Sudden Impulse
Issued: 2017-09-06 23.58 UTC
Geomagnetic Sudden Impulse
Observed: 2017 Sep 06 2348 UTC
Deviation: 21 nT
Station: FRD

ALERT
Geomagnetic K-index of 4
Issued: 2017-09-06 23.57 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Sep 06 2355 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Proton Event 10MeV Integral Flux exceeded 100pfu
Issued: 2017-09-06 23.52 UTC
Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2017 Sep 06 2345 UTC
NOAA Scale: S2 - Moderate

Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience small, increased radiation exposures.
Spacecraft - Infrequent single-event upsets to satellites are possible.
Radio - Small effects on polar HF (high frequency) propagation resulting in fades at lower frequencies.

WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-06 23.32 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Sep 06 2330 UTC
Valid To: 2017 Sep 07 1200 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic Sudden Impulse expected
Issued: 2017-09-06 23.23 UTC
Geomagnetic Sudden Impulse expected
Valid From: 2017 Sep 06 2330 UTC
Valid To: 2017 Sep 07 0010 UTC
IP Shock Passage Observed: 2017 Sep 06 2308 UTC

EXTENDED WARNING
Proton 10MeV Integral Flux above 10pfu expected
Issued: 2017-09-06 23.01 UTC
Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 464
Valid From: 2017 Sep 05 0030 UTC
Now Valid Until: 2017 Sep 08 0600 UTC
Warning Condition: persistence
Predicted NOAA Scale: S1 - Minor

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

WATCH
Geomagnetic Storm Category G3 Predicted
Issued: 2017-09-06 21.27 UTC
Geomagnetic Storm Category G3 Predicted

Highest Storm Level Predicted by Day:
Sep 07: G3 (Strong) Sep 08: G3 (Strong) Sep 09: G3 (Strong)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

ALERT
Type IV Radio Emission
Issued: 2017-09-06 18.00 UTC
Type IV Radio Emission
Begin Time: 2017 Sep 06 1733 UTC

Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

WARNING
Proton 100MeV Integral Flux above 1pfu expected
Issued: 2017-09-06 13.02 UTC
Proton 100MeV Integral Flux above 1pfu expected
Valid From: 2017 Sep 06 1305 UTC
Valid To: 2017 Sep 06 2359 UTC
Warning Condition: Onset

Potential Impacts: An enhancement in the energetic portion of the solar radiation spectrum may indicate increased biological risk to astronauts or passengers and crew in high latitude, high altitude flights. Additionally, energetic particles may represent an increased risk to all satellite systems susceptible to single event effects. This information should be used in conjunction with the current Solar Radiation Storm conditions when assessing overall impact.

SUMMARY
X-ray Event exceeded X1
Issued: 2017-09-06 12.45 UTC
X-ray Event exceeded X1
Begin Time: 2017 Sep 06 1153 UTC
Maximum Time: 2017 Sep 06 1202 UTC
End Time: 2017 Sep 06 1210 UTC
X-ray Class: X9.3
NOAA Scale: R3 - Strong

Comment: Source was Region 2673

Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

ALERT
Type II Radio Emission
Issued: 2017-09-06 12.12 UTC
Type II Radio Emission
Begin Time: 2017 Sep 06 1202 UTC
Estimated Velocity: 1969 km/s

Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

ALERT
Type IV Radio Emission
Issued: 2017-09-06 12.10 UTC
Type IV Radio Emission
Begin Time: 2017 Sep 06 1201 UTC

Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

SUMMARY
10cm Radio Burst
Issued: 2017-09-06 12.09 UTC
10cm Radio Burst
Begin Time: 2017 Sep 06 1154 UTC
Maximum Time: 2017 Sep 06 1156 UTC
End Time: 2017 Sep 06 1157 UTC
Duration: 3 minutes
Peak Flux: 12000 sfu
Latest Penticton Noon Flux: 121 sfu

Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

ALERT
X-Ray Flux exceeded M5
Issued: 2017-09-06 12.00 UTC
X-Ray Flux exceeded M5
Threshold Reached: 2017 Sep 06 1156 UTC
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

SUMMARY
X-ray Event exceeded X1
Issued: 2017-09-06 10.08 UTC
X-ray Event exceeded X1
Begin Time: 2017 Sep 06 0848 UTC
Maximum Time: 2017 Sep 06 0910 UTC
End Time: 2017 Sep 06 0959 UTC
X-ray Class: X2.2
Optical Class: 2b
Location: S08W33
NOAA Scale: R3 - Strong

Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.

SUMMARY
10cm Radio Burst
Issued: 2017-09-06 09.34 UTC
10cm Radio Burst
Begin Time: 2017 Sep 06 0903 UTC
Maximum Time: 2017 Sep 06 0904 UTC
End Time: 2017 Sep 06 0909 UTC
Duration: 6 minutes
Peak Flux: 459 sfu
Latest Penticton Noon Flux: 121 sfu

Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

ALERT
X-Ray Flux exceeded M5
Issued: 2017-09-06 09.12 UTC
X-Ray Flux exceeded M5
Threshold Reached: 2017 Sep 06 0904 UTC
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

SUMMARY
Proton Event 10MeV Integral Flux exceeded 100pfu
Issued: 2017-09-06 06.20 UTC
Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2017 Sep 05 0715 UTC
Maximum Time: 2017 Sep 05 1930 UTC
End Time: 2017 Sep 05 2350 UTC
Maximum 10MeV Flux: 210 pfu
NOAA Scale: S2 - Moderate

Comment: Greater than 10MeV @ 10pfu (S1-Minor) event remains in effect.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-06 05.01 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2654
Begin Time: 2017 Sep 01 1350 UTC
Yesterday Maximum 2MeV Flux: 3777 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

EXTENDED WARNING
Proton 10MeV Integral Flux above 10pfu expected
Issued: 2017-09-05 21.39 UTC
Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 463
Valid From: 2017 Sep 05 0030 UTC
Now Valid Until: 2017 Sep 07 0400 UTC
Warning Condition: persistence
Predicted NOAA Scale: S2 - Moderate

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

WATCH
Geomagnetic Storm Category G3 Predicted
Issued: 2017-09-05 17.14 UTC
Geomagnetic Storm Category G3 Predicted

Highest Storm Level Predicted by Day:
Sep 06: G3 (Strong) Sep 07: G3 (Strong) Sep 08: None (Below G1)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.

WATCH
Geomagnetic Storm Category G2 Predicted
Issued: 2017-09-05 13.13 UTC
Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Sep 05: None (Below G1) Sep 06: G2 (Moderate) Sep 07: G2 (Moderate)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Type IV Radio Emission
Issued: 2017-09-05 12.21 UTC
Type IV Radio Emission
Begin Time: 2017 Sep 05 1139 UTC

Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

EXTENDED WARNING
Proton 10MeV Integral Flux above 10pfu expected
Issued: 2017-09-05 11.37 UTC
Proton 10MeV Integral Flux above 10pfu expected
Extension to Serial Number: 462
Valid From: 2017 Sep 05 0030 UTC
Now Valid Until: 2017 Sep 05 2359 UTC
Warning Condition: persistence
Predicted NOAA Scale: S1 - Minor

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-05 08.26 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2653
Begin Time: 2017 Sep 01 1350 UTC
Yesterday Maximum 2MeV Flux: 15827 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Proton Event 10MeV Integral Flux exceeded 100pfu
Issued: 2017-09-05 07.32 UTC
Proton Event 10MeV Integral Flux exceeded 100pfu
Begin Time: 2017 Sep 05 0715 UTC
NOAA Scale: S2 - Moderate

Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience small, increased radiation exposures.
Spacecraft - Infrequent single-event upsets to satellites are possible.
Radio - Small effects on polar HF (high frequency) propagation resulting in fades at lower frequencies.

ALERT
Type IV Radio Emission
Issued: 2017-09-05 06.01 UTC
Type IV Radio Emission
Begin Time: 2017 Sep 05 0500 UTC

Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

ALERT
Proton Event 10MeV Integral Flux exceeded 10pfu
Issued: 2017-09-05 00.39 UTC
Proton Event 10MeV Integral Flux exceeded 10pfu
Begin Time: 2017 Sep 05 0038 UTC
NOAA Scale: S1 - Minor

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

WARNING
Proton 10MeV Integral Flux above 10pfu expected
Issued: 2017-09-05 00.30 UTC
Proton 10MeV Integral Flux above 10pfu expected
Valid From: 2017 Sep 05 0030 UTC
Valid To: 2017 Sep 05 1200 UTC
Warning Condition: Onset
Predicted NOAA Scale: S1 - Minor

Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-05 00.00 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 04 2359 UTC
Synoptic Period: 2100-2400 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-04 23.25 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3305
Valid From: 2017 Sep 04 1940 UTC
Now Valid Until: 2017 Sep 05 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-04 23.18 UTC
Geomagnetic K-index of 5 expected
Valid From: 2017 Sep 04 2317 UTC
Valid To: 2017 Sep 05 0600 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

SUMMARY
10cm Radio Burst
Issued: 2017-09-04 21.36 UTC
10cm Radio Burst
Begin Time: 2017 Sep 04 2027 UTC
Maximum Time: 2017 Sep 04 2050 UTC
End Time: 2017 Sep 04 2119 UTC
Duration: 52 minutes
Peak Flux: 1600 sfu
Latest Penticton Noon Flux: 183 sfu

Comment: Castelli-U

Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

ALERT
Type II Radio Emission
Issued: 2017-09-04 21.12 UTC
Type II Radio Emission
Begin Time: 2017 Sep 04 2042 UTC
Estimated Velocity: 1472 km/s

Comment: Uncertain quality from Sagamore Hill, no other observatory reports at this time.

Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

ALERT
Geomagnetic K-index of 4
Issued: 2017-09-04 21.03 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Sep 04 2059 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

SUMMARY
X-ray Event exceeded M5
Issued: 2017-09-04 20.50 UTC
X-ray Event exceeded M5
Begin Time: 2017 Sep 04 2028 UTC
Maximum Time: 2017 Sep 04 2033 UTC
End Time: 2017 Sep 04 2037 UTC
X-ray Class: M5.5
NOAA Scale: R2 - Moderate

Comment: Flare occurred from Region 2673

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

ALERT
X-Ray Flux exceeded M5
Issued: 2017-09-04 20.35 UTC
X-Ray Flux exceeded M5
Threshold Reached: 2017 Sep 04 2033 UTC
NOAA Scale: R2 - Moderate

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

SUMMARY
10cm Radio Burst
Issued: 2017-09-04 20.32 UTC
10cm Radio Burst
Begin Time: 2017 Sep 04 2011 UTC
Maximum Time: 2017 Sep 04 2013 UTC
End Time: 2017 Sep 04 2018 UTC
Duration: 5 minutes
Peak Flux: 200 sfu
Latest Penticton Noon Flux: 120 sfu

Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

ALERT
Type IV Radio Emission
Issued: 2017-09-04 19.49 UTC
Type IV Radio Emission
Begin Time: 2017 Sep 04 1938 UTC

Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.

WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-04 19.41 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Sep 04 1940 UTC
Valid To: 2017 Sep 04 2359 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-04 05.02 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2652
Begin Time: 2017 Sep 01 1350 UTC
Yesterday Maximum 2MeV Flux: 12320 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

ALERT
Geomagnetic K-index of 4
Issued: 2017-09-04 02.13 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Sep 04 0213 UTC
Synoptic Period: 0000-0300 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-04 01.34 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Sep 04 0134 UTC
Valid To: 2017 Sep 04 0900 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-03 08.54 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3302
Valid From: 2017 Aug 31 0510 UTC
Now Valid Until: 2017 Sep 03 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-03 07.01 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2651
Begin Time: 2017 Sep 01 1350 UTC
Yesterday Maximum 2MeV Flux: 7573 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-02 20.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3301
Valid From: 2017 Aug 31 0510 UTC
Now Valid Until: 2017 Sep 03 0900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Type II Radio Emission
Issued: 2017-09-02 16.09 UTC
Type II Radio Emission
Begin Time: 2017 Sep 02 1536 UTC
Estimated Velocity: 976 km/s

Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-02 09.48 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3300
Valid From: 2017 Aug 31 0510 UTC
Now Valid Until: 2017 Sep 02 2100 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-02 09.29 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1389
Valid From: 2017 Sep 02 0421 UTC
Now Valid Until: 2017 Sep 02 1500 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-02 08.08 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 02 0808 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-02 05.05 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2650
Begin Time: 2017 Sep 01 1350 UTC
Yesterday Maximum 2MeV Flux: 1769 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WARNING
Geomagnetic K-Index of 6 expected
Issued: 2017-09-02 04.55 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2017 Sep 02 0455 UTC
Valid To: 2017 Sep 02 0900 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

ALERT
Geomagnetic K-index of 5
Issued: 2017-09-02 04.48 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Sep 02 0448 UTC
Synoptic Period: 0300-0600 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-02 04.21 UTC
Geomagnetic K-index of 5 expected
Valid From: 2017 Sep 02 0421 UTC
Valid To: 2017 Sep 02 1000 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-01 23.30 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3299
Valid From: 2017 Aug 31 0510 UTC
Now Valid Until: 2017 Sep 02 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-09-01 14.06 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Sep 01 1350 UTC
Station: GOES13


Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-09-01 10.11 UTC
Geomagnetic K-index of 5 expected
Valid From: 2017 Sep 01 1015 UTC
Valid To: 2017 Sep 01 1500 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-09-01 05.23 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3298
Valid From: 2017 Aug 31 0510 UTC
Now Valid Until: 2017 Sep 01 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-08-31 23.57 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3297
Valid From: 2017 Aug 31 0510 UTC
Now Valid Until: 2017 Sep 01 0600 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-Index of 6 expected
Issued: 2017-08-31 13.36 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2017 Aug 31 1337 UTC
Valid To: 2017 Aug 31 1800 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate

Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-08-31 13.36 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3296
Valid From: 2017 Aug 31 0510 UTC
Now Valid Until: 2017 Aug 31 2359 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-08-31 13.36 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1386
Valid From: 2017 Aug 31 0543 UTC
Now Valid Until: 2017 Aug 31 2100 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Issued: 2017-08-31 13.20 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Aug 31 1319 UTC
Synoptic Period: 1200-1500 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-08-31 11.45 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1385
Valid From: 2017 Aug 31 0543 UTC
Now Valid Until: 2017 Aug 31 1700 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-08-31 11.01 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3295
Valid From: 2017 Aug 31 0510 UTC
Now Valid Until: 2017 Aug 31 1900 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 5
Issued: 2017-08-31 10.34 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Aug 31 1022 UTC
Synoptic Period: 0900-1200 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 5
Issued: 2017-08-31 08.32 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Aug 31 0823 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Geomagnetic K-index of 4
Issued: 2017-08-31 07.17 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Aug 31 0709 UTC
Synoptic Period: 0600-0900 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-08-31 05.44 UTC
Geomagnetic K-index of 5 expected
Valid From: 2017 Aug 31 0543 UTC
Valid To: 2017 Aug 31 1200 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-08-31 05.10 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Aug 31 0510 UTC
Valid To: 2017 Aug 31 1200 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-08-29 23.54 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3293
Valid From: 2017 Aug 29 1929 UTC
Now Valid Until: 2017 Aug 30 0600 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 4
Issued: 2017-08-29 19.34 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Aug 29 1934 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-08-29 19.29 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Aug 29 1929 UTC
Valid To: 2017 Aug 29 2359 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

WATCH
Geomagnetic Storm Category G1 Predicted
Issued: 2017-08-29 18.39 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Aug 30: None (Below G1) Aug 31: G1 (Minor) Sep 01: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-08-29 17.27 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Aug 29 1710 UTC
Station: GOES13


Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

WATCH
Geomagnetic Storm Category G1 Predicted
Issued: 2017-08-28 20.14 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Aug 29: None (Below G1) Aug 30: None (Below G1) Aug 31: G1 (Minor)

THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-08-27 18.46 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Aug 27 1845 UTC
Valid To: 2017 Aug 28 0600 UTC
Warning Condition: Onset

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-08-27 05.01 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2647
Begin Time: 2017 Aug 18 1650 UTC
Yesterday Maximum 2MeV Flux: 10280 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-08-26 05.13 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2646
Begin Time: 2017 Aug 18 1650 UTC
Yesterday Maximum 2MeV Flux: 7706 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-08-25 08.46 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2645
Begin Time: 2017 Aug 18 1650 UTC
Yesterday Maximum 2MeV Flux: 3701 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

SUMMARY
10cm Radio Burst
Issued: 2017-08-25 08.07 UTC
10cm Radio Burst
Begin Time: 2017 Aug 25 0726 UTC
Maximum Time: 2017 Aug 25 0726 UTC
End Time: 2017 Aug 25 0727 UTC
Duration: 1 minutes
Peak Flux: 100 sfu
Latest Penticton Noon Flux: 79 sfu

Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-08-24 05.56 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2644
Begin Time: 2017 Aug 18 1650 UTC
Yesterday Maximum 2MeV Flux: 3710 pfu

Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-08-24 05.13 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3290
Valid From: 2017 Aug 22 2220 UTC
Now Valid Until: 2017 Aug 24 1200 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-08-23 21.21 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3289
Valid From: 2017 Aug 22 2220 UTC
Now Valid Until: 2017 Aug 24 0600 UTC
Warning Condition: Persistence

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

ALERT
Geomagnetic K-index of 5
Issued: 2017-08-23 21.03 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Aug 23 2059 UTC
Synoptic Period: 1800-2100 UTC

Active Warning: Yes
NOAA Scale: G1 - Minor

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

Table

Date Radio flux 10.7 cm SESC Sunspot number Sunspot area 10E-6 New regions GOES15 X-ray Bkgd flux Flares
X-ray Optical
C M X S 1 2 3
2017-08-23 85 40 460 0 B1.1 4 0 0 5 1 0 0
2017-08-24 79 43 440 0 Unk 2 0 0 6 0 0 0
2017-08-25 81 39 280 0 B1.2 1 0 0 5 1 0 0
2017-08-26 78 35 250 0 B1.1 0 0 0 2 0 0 0
2017-08-27 78 22 150 0 B1.1 1 0 0 1 1 0 0
2017-08-28 82 17 100 0 B2.0 1 0 0 0 0 0 0
2017-08-29 84 35 390 2 B2.2 3 0 0 10 0 0 0
2017-08-30 87 42 630 0 B1.9 4 0 0 12 1 0 0
2017-08-31 92 59 950 1 B1.8 0 0 0 5 0 0 0
2017-09-01 93 62 940 0 B2.4 3 0 0 7 0 0 0
2017-09-02 100 71 920 1 B2.3 4 0 0 9 0 0 0
2017-09-03 120 96 1140 1 B3.3 2 0 0 18 0 0 0
2017-09-04 140 122 1470 0 C1.6 8 7 0 17 4 0 1
2017-09-05 121 122 1630 1 C1.2 7 5 0 16 2 0 0
2017-09-06 133 79 1690 0 C1.9 2 3 2 8 1 1 1
2017-09-07 129 94 1660 1 C1.2 8 4 1 11 3 1 0
2017-09-08 117 89 1760 0 B8.6 16 5 0 12 2 2 0
2017-09-09 107 49 1110 0 B6.7 10 3 0 14 1 0 0
2017-09-10 100 38 420 1 B4.9 4 0 1 2 0 0 0
2017-09-11 80 23 110 0 B2.6 0 0 0 0 0 0 0
2017-09-12 76 11 140 0 A8.3 2 0 0 6 0 0 0
2017-09-13 75 11 120 0 A1.6 0 0 0 1 0 0 0
2017-09-14 74 11 120 0 A0.0 0 0 0 0 0 0 0
2017-09-15 73 13 80 0 A1.4 0 0 0 0 0 0 0
2017-09-16 72 13 90 0 A0.0 0 0 0 0 0 0 0
2017-09-17 72 13 80 0 A0.0 0 0 0 0 0 0 0
2017-09-18 72 12 80 0 A0.0 0 0 0 0 0 0 0
2017-09-19 71 11 50 0 A2.0 0 0 0 0 0 0 0
2017-09-20 74 22 120 1 A5.2 0 0 0 0 0 0 0
2017-09-21 73 22 140 0 A1.1 0 0 0 0 0 0 0
Average/Total 91 44 584 9 82 27 4 167 17 4 2

Summary graph

Flares

Solar Wind

Solar Wind

The solar wind is a stream of plasma released from the upper atmosphere of the Sun. It consists of mostly electrons, protons and alpha particles with energies usually between 1.5 and 10 keV. The stream of particles varies in density, temperature, and speed over time and over solar longitude. These particles can escape the Sun's gravity because of their high energy, from the high temperature of the corona and magnetic, electrical and electromagnetic phenomena in it.

The solar wind is divided into two components, respectively termed the slow solar wind and the fast solar wind. The slow solar wind has a velocity of about 400 km/s, a temperature of 1.4–1.6×10e6 K and a composition that is a close match to the corona. By contrast, the fast solar wind has a typical velocity of 750 km/s, a temperature of 8×10e5 K and it nearly matches the composition of the Sun's photosphere. The slow solar wind is twice as dense and more variable in intensity than the fast solar wind. The slow wind also has a more complex structure, with turbulent regions and large-scale structures.

Solar radio flux at 10.7 cm

Solar radio flux at 10.7 cm

The solar radio flux at 10.7 cm (2800 MHz) is an excellent indicator of solar activity. Often called the F10.7 index, it is one of the longest running records of solar activity. The F10.7 radio emissions originates high in the chromosphere and low in the corona of the solar atmosphere. The F10.7 correlates well with the sunspot number as well as a number of UltraViolet (UV) and visible solar irradiance records. Reported in “solar flux units”, (s.f.u.), the F10.7 can vary from below 50 s.f.u., to above 300 s.f.u., over the course of a solar cycle.

Flares

Flares

A solar flare is a sudden flash of brightness observed over the Sun's surface or the solar limb, which is interpreted as a large energy release of up to 6 × 10e25 joules of energy. They are often, but not always, followed by a colossal coronal mass ejection. The flare ejects clouds of electrons, ions, and atoms through the corona of the sun into space. These clouds typically reach Earth a day or two after the event.

Solar flares affect all layers of the solar atmosphere (photosphere, chromosphere, and corona), when the plasma medium is heated to tens of millions of kelvin, while the electrons, protons, and heavier ions are accelerated to near the speed of light. They produce radiation across the electromagnetic spectrum at all wavelengths, from radio waves to gamma rays, although most of the energy is spread over frequencies outside the visual range and for this reason the majority of the flares are not visible to the naked eye and must be observed with special instruments. Flares occur in active regions around sunspots, where intense magnetic fields penetrate the photosphere to link the corona to the solar interior. Flares are powered by the sudden (timescales of minutes to tens of minutes) release of magnetic energy stored in the corona. The same energy releases may produce coronal mass ejections (CME), although the relation between CMEs and flares is still not well established.

The frequency of occurrence of solar flares varies, from several per day when the Sun is particularly "active" to less than one every week when the Sun is "quiet", following the 11-year cycle (the solar cycle). Large flares are less frequent than smaller ones.

Classification

Solar flares are classified as A, B, C, M or X according to the peak flux (in watts per square metre, W/m2) of 100 to 800 picometre X-rays near Earth, as measured on the GOES spacecraft.

Classification Peak Flux Range at 100-800 picometer
W/m2
A < 10e-7
B 10e-7 to 10e-6
C 10e-6 to 10e-5
M 10e-5 to 10e-4
X 10e-4 to 10e-3
Z > 10e-3

An earlier flare classification is based on Hα spectral observations. The scheme uses both the intensity and emitting surface. The classification in intensity is qualitative, referring to the flares as: (f)aint, (n)ormal or (b)rilliant. The emitting surface is measured in terms of millionths of the hemisphere and is described below. (The total hemisphere area AH = 6.2 × 1012 km2.)

Classification Corrected area
(millionths of hemisphere)
S < 100
1 100 - 250
2 250 - 600
3 600 - 1200
4 > 1200

Sunspot number

Sunspots

Sunspots are temporary phenomena on the photosphere of the Sun that appear visibly as dark spots compared to surrounding regions. They correspond to concentrations of magnetic field that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere. Sunspots usually appear in pairs, with pair members of opposite magnetic polarity. The number of sunspots varies according to the approximately 11-year solar cycle.

Sunspot populations quickly rise and more slowly fall on an irregular cycle of 11 years, although significant variations in the number of sunspots attending the 11-year period are known over longer spans of time. For example, from 1900 to the 1960s, the solar maxima trend of sunspot count has been upward; from the 1960s to the present, it has diminished somewhat. Over the last decades the Sun has had a markedly high average level of sunspot activity; it was last similarly active over 8,000 years ago.

The number of sunspots correlates with the intensity of solar radiation over the period since 1979, when satellite measurements of absolute radiative flux became available. Since sunspots are darker than the surrounding photosphere it might be expected that more sunspots would lead to less solar radiation and a decreased solar constant. However, the surrounding margins of sunspots are brighter than the average, and so are hotter; overall, more sunspots increase the Sun's solar constant or brightness. The variation caused by the sunspot cycle to solar output is relatively small, on the order of 0.1% of the solar constant (a peak-to-trough range of 1.3 W/m2 compared to 1366 W/m2 for the average solar constant).

K-indices



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Data


Estimated Planetary

Estimated Planetary

Date A K-indices (UTC)
0h 3h 6h 9h 12h 15h 18h 21h
2017-08-24 11 3 3 3 3 3 2 1 1
2017-08-25 5 1 1 2 2 2 1 1 2
2017-08-26 5 1 1 2 1 1 2 1 1
2017-08-27 10 3 1 1 3 2 3 3 3
2017-08-28 4 1 1 1 1 1 1 0 1
2017-08-29 10 1 2 2 1 1 2 4 3
2017-08-30 5 2 2 2 1 1 0 0 0
2017-08-31 31 2 3 5 5 5 4 4 3
2017-09-01 19 4 3 2 4 4 2 2 4
2017-09-02 26 4 5 5 3 2 3 3 3
2017-09-03 9 3 3 1 2 3 2 2 2
2017-09-04 18 4 3 2 2 2 2 4 5
2017-09-05 12 4 3 3 2 2 3 2 2
2017-09-06 11 2 2 2 3 3 2 0 4
2017-09-07 38 3 4 4 4 3 2 2 8
2017-09-08 96 8 5 4 5 8 7 6 5
2017-09-09 6 3 2 2 1 1 1 1 1
2017-09-10 7 1 0 1 1 1 3 2 4
2017-09-11 11 3 3 2 2 3 2 3 3
2017-09-12 18 3 2 3 2 3 2 4 5
2017-09-13 15 5 3 4 2 2 2 1 0
2017-09-14 25 2 2 1 2 4 6 5 4
2017-09-15 36 6 4 5 3 4 3 5 5
2017-09-16 30 5 6 3 3 4 4 3 4
2017-09-17 17 3 4 2 3 4 4 2 2
2017-09-18 22 4 4 5 4 3 3 2 3
2017-09-19 8 3 2 1 2 2 2 3 3
2017-09-20 10 3 3 2 2 2 1 2 1
2017-09-21 7 1 2 3 2 2 0 1 2
2017-09-22 5 1 1 1 1 1 1

Middle Latitude

Date A K-indices
2017-08-24 16 4 4 4 3 3 2 1 1
2017-08-25 7 1 2 2 2 3 2 1 1
2017-08-26 5 1 1 2 1 2 2 2 1
2017-08-27 6 2 1 0 2 2 2 2 2
2017-08-28 3 1 1 0 2 1 1 1 0
2017-08-29 10 1 2 2 1 2 2 4 3
2017-08-30 5 2 2 2 2 2 0 1 0
2017-08-31 20 2 3 4 5 4 3 3 2
2017-09-01 17 4 3 2 4 4 2 2 3
2017-09-02 25 4 5 5 3 3 3 3 3
2017-09-03 10 3 3 1 2 3 2 2 2
2017-09-04 16 4 3 2 2 2 2 4 4
2017-09-05 11 3 3 3 2 2 3 2 2
2017-09-06 18 2 2 2 4 5 3 1 4
2017-09-07 23 2 3 3 3 4 3 2 6
2017-09-08 50 6 4 4 4 7 5 4 4
2017-09-09 6 3 2 2 1 1 1 1 1
2017-09-10 12 1 1 1 1 2 5 3 3
2017-09-11 8 3 2 2 1 3 1 2 2
2017-09-12 16 3 2 3 3 2 2 3 5
2017-09-13 13 5 3 3 2 2 2 1 1
2017-09-14 19 2 2 1 2 3 5 5 3
2017-09-15 30 6 4 4 3 4 2 4 4
2017-09-16 23 5 5 2 3 3 3 2 4
2017-09-17 13 4 3 2 2 3 3 2 2
2017-09-18 21 4 4 5 3 3 3 2 3
2017-09-19 6 2 1 1 2 2 1 2 2
2017-09-20 8 3 3 2 2 2 1 2 1
2017-09-21 7 1 2 3 2 2 1 1 2
2017-09-22 1 1 1 1 1 2

High Latitude

Date A K-indices
2017-08-24 38 2 5 6 6 6 2 0 0
2017-08-25 6 1 1 1 3 3 1 1 1
2017-08-26 2 0 1 1 0 1 2 1 0
2017-08-27 14 2 1 0 4 2 5 3 2
2017-08-28 6 2 1 1 3 3 1 0 0
2017-08-29 6 1 1 2 0 3 1 3 1
2017-08-30 4 1 1 3 2 1 0 0 0
2017-08-31 42 2 2 5 6 6 6 3 3
2017-09-01 29 3 3 3 6 6 3 2 2
2017-09-02 32 4 5 5 6 3 4 2 2
2017-09-03 17 3 2 1 5 4 4 1 1
2017-09-04 16 2 1 2 5 4 3 2 3
2017-09-05 14 3 3 3 4 4 1 1 1
2017-09-06 9 1 1 2 4 2 2 0 3
2017-09-07 60 3 5 7 7 4 3 3 6
2017-09-08 10 6 6 4 5 9 7 6 4
2017-09-09 3 3 1 1 1 1 0 0 0
2017-09-10 3 0 0 0 0 0 1 1 3
2017-09-11 19 4 3 4 4 4 3 2 2
2017-09-12 25 4 2 3 5 5 4 3 3
2017-09-13 30 4 4 7 4 3 1 0 0
2017-09-14 38 2 1 2 5 6 6 4 5
2017-09-15 51 3 5 5 6 6 6 4 4
2017-09-16 52 5 6 5 6 6 5 3 3
2017-09-17 39 4 3 2 6 6 6 3 2
2017-09-18 51 4 3 7 7 5 4 2 2
2017-09-19 11 1 1 0 4 3 2 2 4
2017-09-20 19 3 3 3 5 5 2 1 0
2017-09-21 9 1 1 4 3 4 0 0 0
2017-09-22 1 1 3 1 2 2

About

The K-index quantifies disturbances in the horizontal component of earth's magnetic field with an integer in the range 0–9 with 1 being calm and 5 or more indicating a geomagnetic storm. It is derived from the maximum fluctuations of horizontal components observed on a magnetometer during a three-hour interval. The label K comes from the German word Kennziffer meaning “characteristic digit”. The K-index was introduced by Julius Bartels in 1938.

The Estimated 3-hour Planetary Kp-index is derived at the NOAA Space Weather Prediction Center using data from the following ground-based magnetometers:

  • Sitka, Alaska
  • Meanook, Canada
  • Ottawa, Canada
  • Fredericksburg, Virginia
  • Hartland, UK
  • Wingst, Germany
  • Niemegk, Germany
  • Canberra, Australia

These data are made available thanks to the cooperative efforts between SWPC and data providers around the world, which currently includes the U.S. Geological Survey, Natural Resources Canada (NRCAN), the British Geological Survey, the German Research Centre for Geosciences (GFZ), and Geoscience Australia. Important magnetometer observations are also contributed by the Institut de Physique du Globe de Paris and the Korean Space Weather Center K-index Watches are issued when the highest predicted NOAA estimated Kp-indices for a day are K = 5, 6, 7, or >= 8 and is reported in terms of the NOAA G scale. K-index Warnings are issued when NOAA estimated Kp-indices of 4, 5, 6, and 7 or greater are expected. K-index Alerts are issued when the NOAA estimated Kp-indices reach 4, 5, 6, 7, 8, or 9.


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