Meteorologia spaziale

Velocità del vento solare Vento solare dei campi magnetici Apice radioflusso a 10.7 cm
Bt Bz

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CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Issued: Sep 18, 2018 10.36 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2845
Begin Time: 2018 Sep 12 1730 UTC
Yesterday Maximum 2MeV Flux: 17212 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: Sep 17, 2018 14.24 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2844
Begin Time: 2018 Sep 12 1730 UTC
Yesterday Maximum 2MeV Flux: 34945 pfu

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

WARNING
Geomagnetic K-index of 4 expected
Issued: Sep 17, 2018 3.21 UTC
Geomagnetic K-index of 4 expected
Valid From: 2018 Sep 17 0320 UTC
Valid To: 2018 Sep 17 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
Emesso: Sep 16, 2018 8.59 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2843
Begin Time: 2018 Sep 12 1730 UTC
Yesterday Maximum 2MeV Flux: 30449 pfu

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Sep 15, 2018 8.59 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2842
Begin Time: 2018 Sep 12 1730 UTC
Yesterday Maximum 2MeV Flux: 42518 pfu

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Sep 14, 2018 8.59 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2841
Begin Time: 2018 Sep 12 1730 UTC
Yesterday Maximum 2MeV Flux: 6646 pfu

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

ALERT
Geomagnetic K-index of 5
Emesso: Sep 14, 2018 3.02 UTC
Geomagnetic K-index of 5
Threshold Reached: 2018 Sep 14 0259 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.

WARNING
Geomagnetic K-index of 5 expected
Emesso: Sep 14, 2018 2.35 UTC
Geomagnetic K-index of 5 expected
Valid From: 2018 Sep 14 0235 UTC
Valid To: 2018 Sep 14 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.

ALERT
Geomagnetic K-index of 4
Emesso: Sep 14, 2018 2.22 UTC
Geomagnetic K-index of 4
Threshold Reached: 2018 Sep 14 0222 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
Emesso: Sep 14, 2018 1.06 UTC
Geomagnetic K-index of 4 expected
Valid From: 2018 Sep 14 0105 UTC
Valid To: 2018 Sep 14 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
Emesso: Sep 13, 2018 14.56 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2840
Begin Time: 2018 Sep 12 1730 UTC
Yesterday Maximum 2MeV Flux: 2290 pfu

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Emesso: Sep 13, 2018 11.32 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3533
Valid From: 2018 Sep 13 0000 UTC
Now Valid Until: 2018 Sep 13 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 4 expected
Emesso: Sep 13, 2018 5.29 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3532
Valid From: 2018 Sep 13 0000 UTC
Now Valid Until: 2018 Sep 13 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
Emesso: Sep 13, 2018 1.52 UTC
Geomagnetic K-index of 4
Threshold Reached: 2018 Sep 13 0152 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
Emesso: Sep 12, 2018 23.57 UTC
Geomagnetic K-index of 4 expected
Valid From: 2018 Sep 13 0000 UTC
Valid To: 2018 Sep 13 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.

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Sep 12, 2018 17.50 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2018 Sep 12 1730 UTC
Station: GOES15


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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Emesso: Sep 11, 2018 23.44 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3530
Valid From: 2018 Sep 10 1610 UTC
Now Valid Until: 2018 Sep 12 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.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Emesso: Sep 11, 2018 11.10 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3529
Valid From: 2018 Sep 10 1610 UTC
Now Valid Until: 2018 Sep 11 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
Emesso: Sep 11, 2018 11.10 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1493
Valid From: 2018 Sep 11 0423 UTC
Now Valid Until: 2018 Sep 11 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.

EXTENDED WARNING
Geomagnetic K-Index of 6 expected
Emesso: Sep 11, 2018 11.10 UTC
Geomagnetic K-Index of 6 expected
Extension to Serial Number: 423
Valid From: 2018 Sep 11 0805 UTC
Now Valid Until: 2018 Sep 11 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.

ALERT
Geomagnetic K-index of 6
Emesso: Sep 11, 2018 10.50 UTC
Geomagnetic K-index of 6
Threshold Reached: 2018 Sep 11 1050 UTC
Synoptic Period: 0900-1200 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
Emesso: Sep 11, 2018 10.08 UTC
Geomagnetic K-index of 5
Threshold Reached: 2018 Sep 11 1008 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
Emesso: Sep 11, 2018 8.17 UTC
Geomagnetic K-index of 6
Threshold Reached: 2018 Sep 11 0817 UTC
Synoptic Period: 0600-0900 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
Emesso: Sep 11, 2018 8.04 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2018 Sep 11 0805 UTC
Valid To: 2018 Sep 11 1200 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
Emesso: Sep 11, 2018 7.39 UTC
Geomagnetic K-index of 5
Threshold Reached: 2018 Sep 11 0739 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
Emesso: Sep 11, 2018 4.37 UTC
Geomagnetic K-index of 5
Threshold Reached: 2018 Sep 11 0436 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.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Emesso: Sep 11, 2018 4.25 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3528
Valid From: 2018 Sep 10 1610 UTC
Now Valid Until: 2018 Sep 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.

WARNING
Geomagnetic K-index of 5 expected
Emesso: Sep 11, 2018 4.24 UTC
Geomagnetic K-index of 5 expected
Valid From: 2018 Sep 11 0423 UTC
Valid To: 2018 Sep 11 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.

ALERT
Geomagnetic K-index of 5
Emesso: Sep 10, 2018 23.44 UTC
Geomagnetic K-index of 5
Threshold Reached: 2018 Sep 10 2344 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 5
Emesso: Sep 10, 2018 21.01 UTC
Geomagnetic K-index of 5
Threshold Reached: 2018 Sep 10 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.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Emesso: Sep 10, 2018 20.36 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1491
Valid From: 2018 Sep 10 1730 UTC
Now Valid Until: 2018 Sep 11 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
Emesso: Sep 10, 2018 20.36 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3527
Valid From: 2018 Sep 10 1610 UTC
Now Valid Until: 2018 Sep 11 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
Emesso: Sep 10, 2018 17.45 UTC
Geomagnetic K-index of 5
Threshold Reached: 2018 Sep 10 1745 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
Emesso: Sep 10, 2018 17.33 UTC
Geomagnetic K-index of 4
Threshold Reached: 2018 Sep 10 1733 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 5 expected
Emesso: Sep 10, 2018 17.29 UTC
Geomagnetic K-index of 5 expected
Valid From: 2018 Sep 10 1730 UTC
Valid To: 2018 Sep 10 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
Emesso: Sep 10, 2018 16.11 UTC
Geomagnetic K-index of 4 expected
Valid From: 2018 Sep 10 1610 UTC
Valid To: 2018 Sep 10 2300 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 G2 Predicted
Emesso: Sep 9, 2018 20.30 UTC
Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Sep 10: None (Below G1) Sep 11: G2 (Moderate) Sep 12: 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 G1 Predicted
Emesso: Sep 9, 2018 19.53 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Sep 10: None (Below G1) Sep 11: G1 (Minor) Sep 12: 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
Emesso: Sep 8, 2018 21.27 UTC
Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Sep 09: None (Below G1) Sep 10: None (Below G1) Sep 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
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Sep 8, 2018 18.12 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2018 Sep 08 1750 UTC
Station: GOES15


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

ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Sep 6, 2018 18.39 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2018 Sep 06 1815 UTC
Station: GOES15


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

WARNING
Geomagnetic K-index of 4 expected
Emesso: Sep 5, 2018 15.27 UTC
Geomagnetic K-index of 4 expected
Valid From: 2018 Sep 05 1526 UTC
Valid To: 2018 Sep 05 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
Emesso: Sep 5, 2018 2.39 UTC
Geomagnetic K-index of 4
Threshold Reached: 2018 Sep 05 0239 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
Emesso: Sep 5, 2018 2.08 UTC
Geomagnetic K-index of 4 expected
Valid From: 2018 Sep 05 0210 UTC
Valid To: 2018 Sep 05 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
Emesso: Sep 4, 2018 17.06 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2836
Begin Time: 2018 Aug 18 1410 UTC
Yesterday Maximum 2MeV Flux: 12435 pfu

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Sep 3, 2018 9.46 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2835
Begin Time: 2018 Aug 18 1410 UTC
Yesterday Maximum 2MeV Flux: 16682 pfu

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Sep 2, 2018 9.00 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2834
Begin Time: 2018 Aug 18 1410 UTC
Yesterday Maximum 2MeV Flux: 20417 pfu

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Sep 1, 2018 9.01 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2833
Begin Time: 2018 Aug 18 1410 UTC
Yesterday Maximum 2MeV Flux: 31634 pfu

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Aug 31, 2018 8.59 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2832
Begin Time: 2018 Aug 18 1410 UTC
Yesterday Maximum 2MeV Flux: 61001 pfu

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Aug 30, 2018 9.00 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2831
Begin Time: 2018 Aug 18 1410 UTC
Yesterday Maximum 2MeV Flux: 57922 pfu

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Aug 29, 2018 8.59 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2830
Begin Time: 2018 Aug 18 1410 UTC
Yesterday Maximum 2MeV Flux: 97635 pfu

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Aug 28, 2018 9.01 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2829
Begin Time: 2018 Aug 18 1410 UTC
Yesterday Maximum 2MeV Flux: 39767 pfu

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Emesso: Aug 28, 2018 2.03 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3523
Valid From: 2018 Aug 25 2109 UTC
Now Valid Until: 2018 Aug 28 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.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Emesso: Aug 27, 2018 19.14 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1489
Valid From: 2018 Aug 27 1632 UTC
Now Valid Until: 2018 Aug 27 2359 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
Geomagnetic K-index of 5
Emesso: Aug 27, 2018 19.12 UTC
Geomagnetic K-index of 5
Threshold Reached: 2018 Aug 27 1912 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 4 expected
Emesso: Aug 27, 2018 18.37 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3522
Valid From: 2018 Aug 25 2109 UTC
Now Valid Until: 2018 Aug 28 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 6
Emesso: Aug 27, 2018 17.59 UTC
Geomagnetic K-index of 6
Threshold Reached: 2018 Aug 27 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
Emesso: Aug 27, 2018 17.49 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2018 Aug 27 1748 UTC
Valid To: 2018 Aug 27 2000 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
Emesso: Aug 27, 2018 17.39 UTC
Geomagnetic K-index of 5
Threshold Reached: 2018 Aug 27 1739 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.

WARNING
Geomagnetic K-index of 5 expected
Emesso: Aug 27, 2018 16.33 UTC
Geomagnetic K-index of 5 expected
Valid From: 2018 Aug 27 1632 UTC
Valid To: 2018 Aug 27 2000 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
Emesso: Aug 27, 2018 13.59 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3521
Valid From: 2018 Aug 25 2109 UTC
Now Valid Until: 2018 Aug 27 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Aug 27, 2018 9.02 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2828
Begin Time: 2018 Aug 18 1410 UTC
Yesterday Maximum 2MeV Flux: 6146 pfu

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

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Emesso: Aug 27, 2018 8.56 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3520
Valid From: 2018 Aug 25 2109 UTC
Now Valid Until: 2018 Aug 27 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.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Emesso: Aug 26, 2018 23.49 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3519
Valid From: 2018 Aug 25 2109 UTC
Now Valid Until: 2018 Aug 27 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.

EXTENDED WARNING
Geomagnetic K-index of 5 expected
Emesso: Aug 26, 2018 23.39 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1487
Valid From: 2018 Aug 25 2146 UTC
Now Valid Until: 2018 Aug 27 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.

WARNING
Geomagnetic K-Index of 6 expected
Emesso: Aug 26, 2018 20.36 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2018 Aug 26 2035 UTC
Valid To: 2018 Aug 26 2359 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
Emesso: Aug 26, 2018 20.23 UTC
Geomagnetic K-index of 5
Threshold Reached: 2018 Aug 26 2020 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 6
Emesso: Aug 26, 2018 16.25 UTC
Geomagnetic K-index of 6
Threshold Reached: 2018 Aug 26 1623 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
Emesso: Aug 26, 2018 16.14 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2018 Aug 26 1613 UTC
Valid To: 2018 Aug 26 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 5 expected
Emesso: Aug 26, 2018 16.14 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1486
Valid From: 2018 Aug 25 2146 UTC
Now Valid Until: 2018 Aug 26 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.

ALERT
Geomagnetic K-index of 5
Emesso: Aug 26, 2018 16.02 UTC
Geomagnetic K-index of 5
Threshold Reached: 2018 Aug 26 1602 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.

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Aug 26, 2018 15.41 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2827
Begin Time: 2018 Aug 18 1410 UTC
Yesterday Maximum 2MeV Flux: 1929 pfu

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

ALERT
Geomagnetic K-index of 5
Emesso: Aug 26, 2018 14.21 UTC
Geomagnetic K-index of 5
Threshold Reached: 2018 Aug 26 1418 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
Emesso: Aug 26, 2018 11.34 UTC
Geomagnetic K-index of 5
Threshold Reached: 2018 Aug 26 1134 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
Emesso: Aug 26, 2018 11.33 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3518
Valid From: 2018 Aug 25 2109 UTC
Now Valid Until: 2018 Aug 26 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
Emesso: Aug 26, 2018 11.33 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1485
Valid From: 2018 Aug 25 2146 UTC
Now Valid Until: 2018 Aug 26 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 7 or greater expected
Emesso: Aug 26, 2018 7.39 UTC
Geomagnetic K-index of 7 or greater expected
Extension to Serial Number: 74
Valid From: 2018 Aug 26 0444 UTC
Now Valid Until: 2018 Aug 26 1200 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.

ALERT
Geomagnetic K-index of 7
Emesso: Aug 26, 2018 7.39 UTC
Geomagnetic K-index of 7
Threshold Reached: 2018 Aug 26 0738 UTC
Synoptic Period: 0600-0900 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.

EXTENDED WARNING
Geomagnetic K-Index of 6 expected
Emesso: Aug 26, 2018 7.07 UTC
Geomagnetic K-Index of 6 expected
Extension to Serial Number: 418
Valid From: 2018 Aug 26 0241 UTC
Now Valid Until: 2018 Aug 26 1200 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 6
Emesso: Aug 26, 2018 7.06 UTC
Geomagnetic K-index of 6
Threshold Reached: 2018 Aug 26 0706 UTC
Synoptic Period: 0600-0900 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
Emesso: Aug 26, 2018 6.38 UTC
Geomagnetic K-index of 5
Threshold Reached: 2018 Aug 26 0637 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 7
Emesso: Aug 26, 2018 6.01 UTC
Geomagnetic K-index of 7
Threshold Reached: 2018 Aug 26 0559 UTC
Synoptic Period: 0300-0600 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.

WARNING
Geomagnetic K-index of 7 or greater expected
Emesso: Aug 26, 2018 4.44 UTC
Geomagnetic K-index of 7 or greater expected
Valid From: 2018 Aug 26 0444 UTC
Valid To: 2018 Aug 26 0900 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.

ALERT
Geomagnetic K-index of 6
Emesso: Aug 26, 2018 4.25 UTC
Geomagnetic K-index of 6
Threshold Reached: 2018 Aug 26 0425 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
Emesso: Aug 26, 2018 3.46 UTC
Geomagnetic K-index of 5
Threshold Reached: 2018 Aug 26 0346 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
Emesso: Aug 26, 2018 2.57 UTC
Geomagnetic K-index of 6
Threshold Reached: 2018 Aug 26 0257 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 5 expected
Emesso: Aug 26, 2018 2.41 UTC
Geomagnetic K-index of 5 expected
Extension to Serial Number: 1484
Valid From: 2018 Aug 25 2146 UTC
Now Valid Until: 2018 Aug 26 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
Emesso: Aug 26, 2018 2.41 UTC
Geomagnetic K-Index of 6 expected
Valid From: 2018 Aug 26 0241 UTC
Valid To: 2018 Aug 26 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.

EXTENDED WARNING
Geomagnetic K-index of 4 expected
Emesso: Aug 26, 2018 2.13 UTC
Geomagnetic K-index of 4 expected
Extension to Serial Number: 3517
Valid From: 2018 Aug 25 2109 UTC
Now Valid Until: 2018 Aug 26 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
Emesso: Aug 26, 2018 1.54 UTC
Geomagnetic K-index of 5
Threshold Reached: 2018 Aug 26 0154 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.

WARNING
Geomagnetic K-index of 5 expected
Emesso: Aug 25, 2018 21.46 UTC
Geomagnetic K-index of 5 expected
Valid From: 2018 Aug 25 2146 UTC
Valid To: 2018 Aug 26 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.

ALERT
Geomagnetic K-index of 4
Emesso: Aug 25, 2018 21.43 UTC
Geomagnetic K-index of 4
Threshold Reached: 2018 Aug 25 2143 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
Emesso: Aug 25, 2018 21.09 UTC
Geomagnetic K-index of 4 expected
Valid From: 2018 Aug 25 2109 UTC
Valid To: 2018 Aug 26 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
Emesso: Aug 25, 2018 17.16 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2826
Begin Time: 2018 Aug 18 1410 UTC
Yesterday Maximum 2MeV Flux: 1967 pfu

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Aug 24, 2018 12.31 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2825
Begin Time: 2018 Aug 18 1410 UTC
Yesterday Maximum 2MeV Flux: 4038 pfu

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Aug 23, 2018 10.35 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2824
Begin Time: 2018 Aug 18 1410 UTC
Yesterday Maximum 2MeV Flux: 4095 pfu

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Aug 22, 2018 9.56 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2823
Begin Time: 2018 Aug 18 1410 UTC
Yesterday Maximum 2MeV Flux: 10333 pfu

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

CONTINUED ALERT
Electron 2MeV Integral Flux exceeded 1000pfu
Emesso: Aug 21, 2018 6.36 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2822
Begin Time: 2018 Aug 18 1410 UTC
Yesterday Maximum 2MeV Flux: 4163 pfu

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

ALERT
Geomagnetic K-index of 4
Emesso: Aug 20, 2018 19.23 UTC
Geomagnetic K-index of 4
Threshold Reached: 2018 Aug 20 1923 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
Emesso: Aug 20, 2018 19.20 UTC
Geomagnetic K-index of 4 expected
Valid From: 2018 Aug 20 1919 UTC
Valid To: 2018 Aug 21 0000 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
Emesso: Aug 20, 2018 19.16 UTC
Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 2821
Begin Time: 2018 Aug 18 1410 UTC
Yesterday Maximum 2MeV Flux: 18287 pfu

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

ALERT
Geomagnetic K-index of 4
Emesso: Aug 20, 2018 3.00 UTC
Geomagnetic K-index of 4
Threshold Reached: 2018 Aug 20 0259 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.

Tabella

Data Radio flux 10.7 cm SESC Numero di macchie solari Zona macchie solari 10E-6 Nuove regioni GOES15 X-ray Bkgd flux Brillamenti
X-ray Ottica
C M X S 1 2 3
Aug 19, 2018 67 15 10 1 A1.2 0 0 0 0 0 0 0
Aug 20, 2018 68 15 10 0 A1.0 0 0 0 0 0 0 0
Aug 21, 2018 68 15 10 0 A1.3 0 0 0 0 0 0 0
Aug 22, 2018 67 12 10 0 A0.0 0 0 0 0 0 0 0
Aug 23, 2018 70 15 40 0 A0.0 0 0 0 0 0 0 0
Aug 24, 2018 72 29 60 1 A0.0 0 0 0 1 0 0 0
Aug 25, 2018 72 31 130 0 A1.9 0 0 0 2 0 0 0
Aug 26, 2018 71 26 70 0 A1.2 0 0 0 0 0 0 0
Aug 27, 2018 70 12 50 0 A1.2 0 0 0 0 0 0 0
Aug 28, 2018 70 11 10 0 A1.5 0 0 0 0 0 0 0
Aug 29, 2018 71 0 0 0 A1.2 0 0 0 0 0 0 0
Aug 30, 2018 68 0 0 0 A1.2 0 0 0 0 0 0 0
Aug 31, 2018 68 0 0 0 A0.0 0 0 0 0 0 0 0
Sep 1, 2018 68 0 0 0 A0.0 0 0 0 0 0 0 0
Sep 2, 2018 68 0 0 0 A0.0 0 0 0 0 0 0 0
Sep 3, 2018 68 0 0 0 A0.0 0 0 0 0 0 0 0
Sep 4, 2018 68 0 0 0 A0.0 0 0 0 0 0 0 0
Sep 5, 2018 68 0 0 0 A0.0 0 0 0 0 0 0 0
Sep 6, 2018 67 0 0 0 A0.0 0 0 0 0 0 0 0
Sep 7, 2018 68 0 0 0 A0.0 0 0 0 0 0 0 0
Sep 8, 2018 69 16 10 1 A0.0 0 0 0 0 0 0 0
Sep 9, 2018 68 12 10 0 A0.0 0 0 0 0 0 0 0
Sep 10, 2018 69 0 0 0 A0.0 0 0 0 0 0 0 0
Sep 11, 2018 69 14 10 1 A0.0 0 0 0 0 0 0 0
Sep 12, 2018 70 11 0 0 A0.0 0 0 0 0 0 0 0
Sep 13, 2018 70 0 0 0 A0.0 0 0 0 0 0 0 0
Sep 14, 2018 69 0 0 0 A0.0 0 0 0 0 0 0 0
Sep 15, 2018 69 0 0 0 A0.0 0 0 0 0 0 0 0
Sep 16, 2018 69 0 0 0 A0.0 0 0 0 0 0 0 0
Sep 17, 2018 68 0 0 0 A0.0 0 0 0 0 0 0 0
Media/Totale 69 8 14 4 0 0 0 3 0 0 0

Grafico riassuntivo

Brillamenti

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).

Indici K



Oggi


0h
UTC
3h
UTC
6h
UTC
9h
UTC
12h
UTC
15h
UTC
18h
UTC
21h
UTC



Data


Estimated Planetary

Estimated Planetary

Data A Indici K (UTC)
0h 3h 6h 9h 12h 15h 18h 21h
Aug 21, 2018 7 3 2 2 2 1 1 1 2
Aug 22, 2018 6 2 3 2 1 2 1 0 2
Aug 23, 2018 5 2 1 2 1 1 1 1 1
Aug 24, 2018 5 0 1 2 2 3 1 1 1
Aug 25, 2018 11 1 1 2 2 2 1 3 4
Aug 26, 2018 76 6 7 7 5 5 6 5 3
Aug 27, 2018 26 2 3 3 4 4 6 5 3
Aug 28, 2018 10 4 3 2 3 2 1 0 1
Aug 29, 2018 6 2 2 1 1 1 2 1 2
Aug 30, 2018 4 2 1 1 1 1 0 1 2
Aug 31, 2018 5 2 1 1 1 1 2 2 1
Sep 1, 2018 5 1 1 1 1 2 1 2 1
Sep 2, 2018 5 2 2 2 1 1 1 1 2
Sep 3, 2018 5 2 2 1 1 1 1 1 1
Sep 4, 2018 9 2 3 3 1 1 2 2 3
Sep 5, 2018 11 4 3 2 3 3 2 2 1
Sep 6, 2018 6 2 1 2 1 1 1 1 2
Sep 7, 2018 5 2 2 1 1 1 1 1 1
Sep 8, 2018 5 1 1 3 1 1 1 1 2
Sep 9, 2018 7 2 2 1 1 2 1 2 3
Sep 10, 2018 21 1 1 1 2 3 5 5 5
Sep 11, 2018 35 4 5 6 6 4 3 3 2
Sep 12, 2018 9 2 2 1 2 2 2 2 3
Sep 13, 2018 17 4 4 3 3 3 3 2 3
Sep 14, 2018 16 5 4 3 2 2 2 3 3
Sep 15, 2018 8 3 3 2 2 2 1 1 2
Sep 16, 2018 6 2 2 2 2 1 0 1 2
Sep 17, 2018 11 3 3 2 2 2 2 3 3
Sep 18, 2018 6 3 2 2 2 1 1 1 1
Sep 19, 2018

Middle Latitude

Data A Indici K
Aug 21, 2018 6 2 1 2 2 2 1 1 2
Aug 22, 2018 8 2 3 1 1 3 2 1 2
Aug 23, 2018 5 2 1 2 1 2 1 2 1
Aug 24, 2018 7 0 1 2 2 3 1 3 1
Aug 25, 2018 12 1 1 3 3 3 2 2 4
Aug 26, 2018 34 4 4 6 4 4 5 4 2
Aug 27, 2018 20 3 3 3 4 4 4 4 2
Aug 28, 2018 9 3 3 2 3 2 1 1 2
Aug 29, 2018 7 2 2 2 2 2 2 2 2
Aug 30, 2018 5 2 1 1 2 2 0 1 2
Aug 31, 2018 4 1 1 1 1 2 1 2 0
Sep 1, 2018 5 1 1 0 2 3 1 1 1
Sep 2, 2018 5 1 2 2 1 1 1 1 2
Sep 3, 2018 4 1 2 0 1 2 2 1 1
Sep 4, 2018 9 2 3 3 1 2 1 2 3
Sep 5, 2018 9 3 2 2 2 3 2 2 1
Sep 6, 2018 5 2 1 2 1 1 1 1 2
Sep 7, 2018 5 3 2 0 1 2 2 1 0
Sep 8, 2018 5 0 1 2 2 2 1 1 2
Sep 9, 2018 6 1 1 2 2 2 1 2 2
Sep 10, 2018 15 1 1 1 3 3 3 3 5
Sep 11, 2018 24 4 4 5 5 3 2 3 2
Sep 12, 2018 10 2 2 1 2 2 3 3 3
Sep 13, 2018 17 4 4 4 3 2 3 2 2
Sep 14, 2018 11 4 3 2 2 2 2 2 2
Sep 15, 2018 7 3 2 2 2 2 1 1 2
Sep 16, 2018 5 2 1 2 2 1 1 1 1
Sep 17, 2018 9 3 2 2 2 2 2 2 3
Sep 18, 2018 5 2 1 2 2 1 1 1 1
Sep 19, 2018

High Latitude

Data A Indici K
Aug 21, 2018 10 2 2 4 4 2 1 0 1
Aug 22, 2018 5 2 2 3 1 1 1 0 1
Aug 23, 2018 2 1 1 2 0 1 0 1 0
Aug 24, 2018 11 0 0 1 3 5 3 1 0
Aug 25, 2018 6 2 2 1 1 1 1 2 3
Aug 26, 2018 90 4 5 8 7 7 6 4 3
Aug 27, 2018 56 2 2 6 6 6 7 5 1
Aug 28, 2018 21 3 2 3 6 5 0 1 0
Aug 29, 2018 5 1 1 1 3 1 1 1 1
Aug 30, 2018 2 1 1 1 1 0 0 0 0
Aug 31, 2018 4 1 1 0 2 2 2 2 0
Sep 1, 2018 2 1 1 0 0 1 0 1 1
Sep 2, 2018 2 1 1 1 0 0 1 1 1
Sep 3, 2018 3 2 2 0 1 0 2 0 0
Sep 4, 2018 7 1 3 3 2 1 1 1 1
Sep 5, 2018 20 2 2 1 6 4 4 1 1
Sep 6, 2018 7 1 1 3 2 3 2 1 0
Sep 7, 2018 4 1 1 1 2 2 2 0 0
Sep 8, 2018 2 1 0 1 0 1 0 0 1
Sep 9, 2018 4 0 1 2 0 1 1 2 2
Sep 10, 2018 23 0 0 2 3 5 5 5 3
Sep 11, 2018 62 2 4 8 7 5 3 3 2
Sep 12, 2018 9 2 1 1 4 3 2 2 1
Sep 13, 2018 31 3 3 4 6 5 5 2 2
Sep 14, 2018 24 5 4 3 5 4 2 3 2
Sep 15, 2018 8 2 2 3 3 2 1 1 1
Sep 16, 2018 4 2 1 2 2 2 0 1 0
Sep 17, 2018 8 2 3 3 2 2 2 1 1
Sep 18, 2018 12 2 1 3 5 3 1 1 1
Sep 19, 2018

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.


More info
Origine dati: NOAA, Wikipedia

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