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: 2017-11-23 09.35 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2710
Begin Time: 2017 Nov 22 1020 UTC
Yesterday Maximum 2MeV Flux: 2743 pfu

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

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-11-22 10.37 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Nov 22 1020 UTC
Station: GOES13


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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-11-21 22.43 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3380
Valid From: 2017 Nov 20 2320 UTC
Now Valid Until: 2017 Nov 22 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.

CANCEL WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-11-21 22.42 UTC
Geomagnetic K-index of 5 expected
Cancel Serial Number: 1441
Original Issue Time: 2017 Nov 21 0434 UTC

Comment: G1 Warrning extension issued by mistake.

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: 2017-11-21 22.40 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1440
Valid From: 2017 Nov 21 0432 UTC
Now Valid Until: 2017 Nov 22 0600 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: 2017-11-21 11.48 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1439
Valid From: 2017 Nov 21 0432 UTC
Now Valid Until: 2017 Nov 21 1800 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: 2017-11-21 11.48 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3379
Valid From: 2017 Nov 20 2320 UTC
Now Valid Until: 2017 Nov 21 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: 2017-11-21 08.25 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Nov 21 0825 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 5
Issued: 2017-11-21 05.31 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Nov 21 0530 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: 2017-11-21 04.34 UTC
Geomagnetic K-index of 5 expected
Valid From: 2017 Nov 21 0432 UTC
Valid To: 2017 Nov 21 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.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-11-21 04.34 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3378
Valid From: 2017 Nov 20 2320 UTC
Now Valid Until: 2017 Nov 21 1500 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: 2017-11-20 23.40 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Nov 20 2340 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.

WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-11-20 23.18 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Nov 20 2320 UTC
Valid To: 2017 Nov 21 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: 2017-11-20 14.13 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2708
Begin Time: 2017 Nov 17 1150 UTC
Yesterday Maximum 2MeV Flux: 1481 pfu

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

CANCEL WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-11-20 13.30 UTC
Geomagnetic K-index of 4 expected
Cancel Serial Number: 3376
Original Issue Time: 2017 Nov 20 1301 UTC

Comment: Conditions no longer a potential for near storm activity

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: 2017-11-20 13.01 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Nov 20 1300 UTC
Valid To: 2017 Nov 20 2100 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: 2017-11-19 13.16 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2707
Begin Time: 2017 Nov 17 1150 UTC
Yesterday Maximum 2MeV Flux: 2356 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: 2017-11-18 11.36 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2706
Begin Time: 2017 Nov 17 1150 UTC
Yesterday Maximum 2MeV Flux: 2332 pfu

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

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-11-17 12.07 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Nov 17 1150 UTC
Station: GOES-13


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

WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-11-16 05.01 UTC
Geomagnetic K-index of 5 expected
Valid From: 2017 Nov 16 0500 UTC
Valid To: 2017 Nov 16 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.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-11-16 02.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3374
Valid From: 2017 Nov 15 1610 UTC
Now Valid Until: 2017 Nov 16 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: 2017-11-15 20.50 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3373
Valid From: 2017 Nov 15 1610 UTC
Now Valid Until: 2017 Nov 16 0300 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: 2017-11-15 18.00 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Nov 15 1759 UTC
Synoptic Period: 1500-1800 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: 2017-11-15 16.10 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Nov 15 1610 UTC
Valid To: 2017 Nov 15 2100 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
Geomagnetic K-index of 4
Issued: 2017-11-15 12.01 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Nov 15 1159 UTC
Synoptic Period: 0900-1200 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: 2017-11-15 11.11 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Nov 15 1110 UTC
Valid To: 2017 Nov 15 1500 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: 2017-11-15 09.05 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2704
Begin Time: 2017 Nov 08 1100 UTC
Yesterday Maximum 2MeV Flux: 12790 pfu

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

WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-11-14 16.02 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Nov 14 1603 UTC
Valid To: 2017 Nov 14 2100 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: 2017-11-14 06.06 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2703
Begin Time: 2017 Nov 08 1100 UTC
Yesterday Maximum 2MeV Flux: 20582 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: 2017-11-13 05.00 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2702
Begin Time: 2017 Nov 08 1100 UTC
Yesterday Maximum 2MeV Flux: 23581 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: 2017-11-12 05.01 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2701
Begin Time: 2017 Nov 08 1100 UTC
Yesterday Maximum 2MeV Flux: 25349 pfu

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

CANCEL WATCH
Geomagnetic Storm Category G1 Predicted
Issued: 2017-11-11 11.57 UTC
Geomagnetic Storm Category G1 Predicted
Cancel Serial Number: 808
Original Issue Time: 2017 Nov 08 2037 UTC

Comment: Current solar wind conditions no longer warrant G1 (Minor) geomagnetic storm levels.

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: 2017-11-11 11.53 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3369
Valid From: 2017 Nov 09 1615 UTC
Now Valid Until: 2017 Nov 11 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-11-11 05.01 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2700
Begin Time: 2017 Nov 08 1100 UTC
Yesterday Maximum 2MeV Flux: 17454 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: 2017-11-10 16.50 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3368
Valid From: 2017 Nov 09 1615 UTC
Now Valid Until: 2017 Nov 11 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
Geomagnetic K-index of 4
Issued: 2017-11-10 15.02 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Nov 10 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-11-10 05.00 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2699
Begin Time: 2017 Nov 08 1100 UTC
Yesterday Maximum 2MeV Flux: 20292 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: 2017-11-09 23.28 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3367
Valid From: 2017 Nov 09 1615 UTC
Now Valid Until: 2017 Nov 10 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
Geomagnetic K-index of 4
Issued: 2017-11-09 17.43 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Nov 09 1735 UTC
Synoptic Period: 1500-1800 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: 2017-11-09 16.13 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Nov 09 1615 UTC
Valid To: 2017 Nov 09 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: 2017-11-09 07.55 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2698
Begin Time: 2017 Nov 08 1100 UTC
Yesterday Maximum 2MeV Flux: 2067 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: 2017-11-09 05.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3365
Valid From: 2017 Nov 07 0315 UTC
Now Valid Until: 2017 Nov 09 1500 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: 2017-11-08 23.59 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Nov 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.

WATCH
Geomagnetic Storm Category G1 Predicted
Issued: 2017-11-08 20.37 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Nov 09: G1 (Minor) Nov 10: G1 (Minor) Nov 11: 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
Geomagnetic K-index of 5
Issued: 2017-11-08 18.02 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Nov 08 1758 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: 2017-11-08 17.40 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1436
Valid From: 2017 Nov 07 0745 UTC
Now Valid Until: 2017 Nov 09 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.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-11-08 17.40 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3364
Valid From: 2017 Nov 07 0315 UTC
Now Valid Until: 2017 Nov 09 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: 2017-11-08 13.42 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Nov 08 1339 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
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-11-08 11.18 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2017 Nov 08 1100 UTC
Station: GOES13


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

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-11-08 10.10 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1435
Valid From: 2017 Nov 07 0745 UTC
Now Valid Until: 2017 Nov 08 1800 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: 2017-11-08 10.10 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3363
Valid From: 2017 Nov 07 0315 UTC
Now Valid Until: 2017 Nov 08 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.

ALERT
Geomagnetic K-index of 5
Issued: 2017-11-08 10.05 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Nov 08 1005 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 6
Issued: 2017-11-08 04.30 UTC
Geomagnetic K-index of 6
Threshold Reached: 2017 Nov 08 0429 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.

ALERT
Geomagnetic K-index of 5
Issued: 2017-11-08 04.06 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Nov 08 0405 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 6
Issued: 2017-11-08 02.31 UTC
Geomagnetic K-index of 6
Threshold Reached: 2017 Nov 08 0230 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: 2017-11-08 01.48 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Nov 08 0147 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 4 expected
Issued: 2017-11-07 23.40 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3362
Valid From: 2017 Nov 07 0315 UTC
Now Valid Until: 2017 Nov 08 1500 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: 2017-11-07 23.17 UTC
Geomagnetic K-index of 6
Threshold Reached: 2017 Nov 07 2317 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.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-11-07 23.16 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1434
Valid From: 2017 Nov 07 0745 UTC
Now Valid Until: 2017 Nov 08 1200 UTC
Warning Condition: Persistence

Comment: This is a correction to the previous G1 extension. New ending valid time is on 08 Nov 2017 @ 1200 UTC, not 07 Nov.

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: 2017-11-07 23.04 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1433
Valid From: 2017 Nov 07 0745 UTC
Now Valid Until: 2017 Nov 07 1200 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: 2017-11-07 23.04 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2017 Nov 07 2305 UTC
Valid To: 2017 Nov 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.

ALERT
Geomagnetic K-index of 5
Issued: 2017-11-07 22.39 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Nov 07 2238 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.

WATCH
Geomagnetic Storm Category G1 Predicted
Issued: 2017-11-07 21.16 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Nov 08: G1 (Minor) Nov 09: G1 (Minor) Nov 10: 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.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-11-07 20.15 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1432
Valid From: 2017 Nov 07 0745 UTC
Now Valid Until: 2017 Nov 08 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: 2017-11-07 19.24 UTC
Geomagnetic K-index of 6
Threshold Reached: 2017 Nov 07 1921 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
Geomagnetic K-index of 5
Issued: 2017-11-07 18.40 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Nov 07 1835 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.

WARNING
Geomagnetic K-Index of 6 expected
Issued: 2017-11-07 18.30 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2017 Nov 07 1830 UTC
Valid To: 2017 Nov 07 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.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-11-07 14.13 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1431
Valid From: 2017 Nov 07 0745 UTC
Now Valid Until: 2017 Nov 07 2200 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: 2017-11-07 14.13 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3361
Valid From: 2017 Nov 07 0315 UTC
Now Valid Until: 2017 Nov 08 0700 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: 2017-11-07 11.55 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Nov 07 1155 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.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-11-07 11.54 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3360
Valid From: 2017 Nov 07 0315 UTC
Now Valid Until: 2017 Nov 07 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.

ALERT
Geomagnetic K-index of 4
Issued: 2017-11-07 08.59 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Nov 07 0859 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: 2017-11-07 07.46 UTC
Geomagnetic K-index of 5 expected
Valid From: 2017 Nov 07 0745 UTC
Valid To: 2017 Nov 07 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.

WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-11-07 03.16 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Nov 07 0315 UTC
Valid To: 2017 Nov 07 1500 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: 2017-11-06 19.23 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Nov 07: G1 (Minor) Nov 08: G1 (Minor) Nov 09: 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.

WATCH
Geomagnetic Storm Category G1 Predicted
Issued: 2017-11-05 14.57 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Nov 06: None (Below G1) Nov 07: G1 (Minor) Nov 08: 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.

WATCH
Geomagnetic Storm Category G1 Predicted
Issued: 2017-11-04 17.59 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Nov 05: None (Below G1) Nov 06: None (Below G1) Nov 07: 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.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-11-03 08.24 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3358
Valid From: 2017 Nov 03 0001 UTC
Now Valid Until: 2017 Nov 03 1500 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: 2017-11-03 02.33 UTC
Geomagnetic K-index of 4
Threshold Reached: 2017 Nov 03 0233 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: 2017-11-03 00.03 UTC
Geomagnetic K-index of 4 expected
Valid From: 2017 Nov 03 0001 UTC
Valid To: 2017 Nov 03 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-11-01 10.21 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2696
Begin Time: 2017 Oct 24 1245 UTC
Yesterday Maximum 2MeV Flux: 3054 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: 2017-10-31 05.00 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2695
Begin Time: 2017 Oct 24 1245 UTC
Yesterday Maximum 2MeV Flux: 3668 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: 2017-10-30 05.06 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2694
Begin Time: 2017 Oct 24 1245 UTC
Yesterday Maximum 2MeV Flux: 3104 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: 2017-10-29 07.46 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2693
Begin Time: 2017 Oct 24 1245 UTC
Yesterday Maximum 2MeV Flux: 2203 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: 2017-10-28 09.26 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2692
Begin Time: 2017 Oct 24 1245 UTC
Yesterday Maximum 2MeV Flux: 1897 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: 2017-10-27 13.36 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2691
Begin Time: 2017 Oct 24 1245 UTC
Yesterday Maximum 2MeV Flux: 2155 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: 2017-10-26 12.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3356
Valid From: 2017 Oct 24 1216 UTC
Now Valid Until: 2017 Oct 27 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 5 expected
Issued: 2017-10-26 12.53 UTC
Geomagnetic K-index of 5 expected
Valid From: 2017 Oct 26 1253 UTC
Valid To: 2017 Oct 26 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.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Issued: 2017-10-26 11.14 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3355
Valid From: 2017 Oct 24 1216 UTC
Now Valid Until: 2017 Oct 26 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-10-26 08.51 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2690
Begin Time: 2017 Oct 24 1245 UTC
Yesterday Maximum 2MeV Flux: 1568 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: 2017-10-26 05.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3354
Valid From: 2017 Oct 24 1216 UTC
Now Valid Until: 2017 Oct 26 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: 2017-10-25 17.55 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3353
Valid From: 2017 Oct 24 1216 UTC
Now Valid Until: 2017 Oct 26 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: 2017-10-25 17.52 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2689
Begin Time: 2017 Oct 24 1245 UTC
Yesterday Maximum 2MeV Flux: 2102 pfu

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

ALERT
Geomagnetic K-index of 5
Issued: 2017-10-25 08.59 UTC
Geomagnetic K-index of 5
Threshold Reached: 2017 Oct 25 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 4 expected
Issued: 2017-10-25 08.56 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3352
Valid From: 2017 Oct 24 1216 UTC
Now Valid Until: 2017 Oct 25 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.

WARNING
Geomagnetic K-index of 5 expected
Issued: 2017-10-25 08.00 UTC
Geomagnetic K-index of 5 expected
Valid From: 2017 Oct 25 0800 UTC
Valid To: 2017 Oct 25 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.

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
2017-10-25 79 24 70 0 A7.7 0 0 0 0 0 0 0
2017-10-26 77 23 50 0 A7.5 0 0 0 0 0 0 0
2017-10-27 76 23 60 0 A6.6 0 0 0 0 0 0 0
2017-10-28 75 22 20 0 A6.0 0 0 0 0 0 0 0
2017-10-29 75 23 20 0 A5.8 0 0 0 0 0 0 0
2017-10-30 76 22 10 0 A5.7 0 0 0 0 0 0 0
2017-10-31 75 11 0 0 A5.5 0 0 0 0 0 0 0
2017-11-01 73 0 0 0 A5.3 0 0 0 0 0 0 0
2017-11-02 74 0 0 0 A5.2 0 0 0 0 0 0 0
2017-11-03 73 0 0 0 A5.4 0 0 0 0 0 0 0
2017-11-04 72 0 0 0 A5.0 0 0 0 0 0 0 0
2017-11-05 71 0 0 0 A4.2 0 0 0 0 0 0 0
2017-11-06 69 0 0 0 A3.7 0 0 0 0 0 0 0
2017-11-07 68 0 0 0 A3.4 0 0 0 0 0 0 0
2017-11-08 68 0 0 0 A3.6 0 0 0 0 0 0 0
2017-11-09 66 0 0 0 A3.9 0 0 0 0 0 0 0
2017-11-10 69 0 0 0 A3.9 0 0 0 0 0 0 0
2017-11-11 67 0 0 0 A4.1 0 0 0 0 0 0 0
2017-11-12 69 0 0 0 A5.4 0 0 0 0 0 0 0
2017-11-13 72 0 0 0 A6.9 0 0 0 0 0 0 0
2017-11-14 74 14 50 1 A6.7 0 0 0 3 0 0 0
2017-11-15 74 14 90 0 A6.5 0 0 0 0 0 0 0
2017-11-16 73 15 90 0 A5.9 0 0 0 0 0 0 0
2017-11-17 76 26 70 1 A6.3 0 0 0 0 0 0 0
2017-11-18 76 14 30 0 A6.0 0 0 0 0 0 0 0
2017-11-19 74 0 0 0 A5.7 0 0 0 0 0 0 0
2017-11-20 74 0 0 0 A5.2 0 0 0 0 0 0 0
2017-11-21 73 0 0 0 A5.2 0 0 0 0 0 0 0
2017-11-22 73 0 0 0 A5.2 0 0 0 0 0 0 0
2017-11-23 72 0 0 0 A5.0 0 0 0 0 0 0 0
Average/Total 73 8 19 2 0 0 0 3 0 0 0

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
2017-10-26 20 4 2 4 4 4 4 3 1
2017-10-27 5 3 1 1 1 0 0 2 2
2017-10-28 6 2 2 2 2 1 1 1 1
2017-10-29 4 1 2 1 1 1 1 1 0
2017-10-30 3 1 1 0 0 1 0 0 1
2017-10-31 3 1 0 0 1 2 0 0 0
2017-11-01 4 1 0 1 1 1 1 1 1
2017-11-02 8 3 2 2 1 2 1 2 3
2017-11-03 9 4 2 2 2 3 1 1 1
2017-11-04 4 1 1 1 1 1 1 1 1
2017-11-05 3 1 1 0 0 0 0 1 1
2017-11-06 2 1 0 0 0 0 0 1 0
2017-11-07 36 1 3 4 5 4 4 6 6
2017-11-08 47 6 6 3 5 5 5 3 5
2017-11-09 20 4 4 3 3 3 4 3 4
2017-11-10 21 3 4 4 4 4 4 3 3
2017-11-11 8 3 2 2 2 2 1 1 1
2017-11-12 6 1 2 1 1 1 1 2 2
2017-11-13 6 2 2 2 2 1 2 1 1
2017-11-14 11 3 3 3 2 1 3 2 3
2017-11-15 14 2 3 3 4 2 4 3 2
2017-11-16 14 4 4 3 2 1 1 2 3
2017-11-17 6 1 2 2 3 2 0 0 1
2017-11-18 6 2 2 2 2 2 1 1 2
2017-11-19 5 1 2 3 1 0 0 1 1
2017-11-20 8 1 1 0 1 1 2 3 4
2017-11-21 28 4 5 5 4 3 3 4 4
2017-11-22 10 3 3 2 2 3 2 3 2
2017-11-23 9 2 1 3 3 2 2 2 3
2017-11-24 10 3

Middle Latitude

Date A K-indices
2017-10-26 16 4 2 4 4 3 3 2 1
2017-10-27 4 2 2 1 1 1 0 2 1
2017-10-28 5 1 2 2 2 1 1 1 1
2017-10-29 3 1 2 0 1 2 1 1 0
2017-10-30 1 0 1 0 0 1 0 0 0
2017-10-31 2 1 0 0 0 2 1 0 0
2017-11-01 2 1 0 0 1 1 1 1 1
2017-11-02 12 3 2 1 1 2 1 4 4
2017-11-03 7 3 2 2 2 3 0 1 1
2017-11-04 2 1 1 0 1 1 1 0 1
2017-11-05 1 1 0 0 0 1 0 0 0
2017-11-06 0 0 0 0 0 0 0 1 0
2017-11-07 26 1 3 4 4 3 3 4 6
2017-11-08 39 6 5 3 5 5 4 3 4
2017-11-09 11 3 3 2 2 2 3 2 3
2017-11-10 13 3 3 3 2 3 3 2 3
2017-11-11 7 3 2 3 2 1 1 1 1
2017-11-12 4 0 2 1 1 1 1 1 2
2017-11-13 6 2 2 2 2 1 2 1 1
2017-11-14 8 3 3 2 2 1 2 1 2
2017-11-15 11 1 3 3 3 2 3 2 2
2017-11-16 11 4 3 3 2 2 1 1 2
2017-11-17 5 2 2 2 2 1 1 0 1
2017-11-18 5 2 1 2 2 1 1 1 1
2017-11-19 5 1 2 3 1 1 0 1 1
2017-11-20 7 1 0 0 0 1 2 3 4
2017-11-21 16 3 4 4 3 2 2 3 3
2017-11-22 7 2 2 2 2 2 1 2 2
2017-11-23 7 2 1 2 3 2 1 1 2
2017-11-24 2

High Latitude

Date A K-indices
2017-10-26 41 2 2 5 6 6 6 3 2
2017-10-27 4 1 1 1 3 1 0 1 1
2017-10-28 13 1 1 5 5 1 0 0 0
2017-10-29 2 1 1 1 2 1 0 0 0
2017-10-30 0 0 0 0 0 0 0 0 0
2017-10-31 1 0 0 0 2 1 0 0 0
2017-11-01 2 0 0 0 1 3 0 0 0
2017-11-02 3 0 0 2 2 1 0 1 1
2017-11-03 15 2 1 2 5 5 1 0 1
2017-11-04 3 0 0 1 1 2 2 1 0
2017-11-05 0 0 0 0 0 0 0 0 0
2017-11-06 0 0 0 0 0 0 0 0 0
2017-11-07 42 0 2 5 6 4 5 6 5
2017-11-08 82 5 6 6 7 7 7 3 3
2017-11-09 45 3 3 6 6 6 5 4 3
2017-11-10 53 3 3 6 7 6 6 2 2
2017-11-11 16 3 2 3 5 4 2 1 1
2017-11-12 4 1 1 0 3 2 0 0 1
2017-11-13 9 0 1 2 4 3 3 1 0
2017-11-14 18 1 1 4 5 3 4 3 2
2017-11-15 27 1 2 5 6 3 5 2 2
2017-11-16 15 2 3 4 5 2 1 1 2
2017-11-17 19 1 2 4 6 4 1 0 1
2017-11-18 13 0 1 5 4 3 2 1 0
2017-11-19 2 0 1 2 1 0 0 0 0
2017-11-20 2 0 0 0 1 0 0 2 1
2017-11-21 33 2 5 6 5 4 4 3 3
2017-11-22 25 2 2 5 5 5 4 2 2
2017-11-23 13 0 0 3 4 5 2 1 1
2017-11-24 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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