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Alerts Issued in April 2012


Space Weather Message Code: ALTTP2
Serial Number: 793
Issue Time: 2012 Apr 30 0802 UTC

ALERT: Type II Radio Emission
Begin Time: 2012 Apr 30 0727 UTC
Estimated Velocity: 645 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.


Space Weather Message Code: ALTEF3
Serial Number: 1894
Issue Time: 2012 Apr 30 0504 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 1893
Begin Time: 2012 Apr 25 0220 UTC
Yesterday Maximum 2MeV Flux: 5537 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTEF3
Serial Number: 1893
Issue Time: 2012 Apr 29 0459 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 1892
Begin Time: 2012 Apr 25 0220 UTC
Yesterday Maximum 2MeV Flux: 9630 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTEF3
Serial Number: 1892
Issue Time: 2012 Apr 28 0459 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 1891
Begin Time: 2012 Apr 25 0220 UTC
Yesterday Maximum 2MeV Flux: 8210 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTEF3
Serial Number: 1891
Issue Time: 2012 Apr 27 0459 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 1890
Begin Time: 2012 Apr 25 0220 UTC
Yesterday Maximum 2MeV Flux: 2637 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTTP2
Serial Number: 792
Issue Time: 2012 Apr 26 1658 UTC

ALERT: Type II Radio Emission
Begin Time: 2012 Apr 26 1558 UTC
Estimated Velocity: 424 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.


Space Weather Message Code: WARK04
Serial Number: 1922
Issue Time: 2012 Apr 26 1258 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1921
Valid From: 2012 Apr 23 1610 UTC
Now Valid Until: 2012 Apr 26 1900 UTC
Warning Condition: Persistence
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.


Space Weather Message Code: ALTEF3
Serial Number: 1890
Issue Time: 2012 Apr 26 0729 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 1889
Begin Time: 2012 Apr 25 0220 UTC
Yesterday Maximum 2MeV Flux: 10980 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: WARK06
Serial Number: 195
Issue Time: 2012 Apr 26 0322 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2012 Apr 26 0322 UTC
Valid To: 2012 Apr 26 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.


Space Weather Message Code: ALTK05
Serial Number: 685
Issue Time: 2012 Apr 26 0245 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2012 Apr 26 0240 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.


Space Weather Message Code: WARK05
Serial Number: 772
Issue Time: 2012 Apr 26 0238 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2012 Apr 26 0237 UTC
Valid To: 2012 Apr 26 1300 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.


Space Weather Message Code: WARK05
Serial Number: 771
Issue Time: 2012 Apr 25 1917 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2012 Apr 25 1915 UTC
Valid To: 2012 Apr 26 0100 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.


Space Weather Message Code: WARK04
Serial Number: 1921
Issue Time: 2012 Apr 25 1813 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1920
Valid From: 2012 Apr 23 1610 UTC
Now Valid Until: 2012 Apr 26 1300 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.


Space Weather Message Code: WARK04
Serial Number: 1920
Issue Time: 2012 Apr 25 1151 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1919
Valid From: 2012 Apr 23 1610 UTC
Now Valid Until: 2012 Apr 25 1900 UTC
Warning Condition: Persistence
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.


Space Weather Message Code: ALTEF3
Serial Number: 1889
Issue Time: 2012 Apr 25 1139 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 1888
Begin Time: 2012 Apr 25 0220 UTC
Yesterday Maximum 2MeV Flux: 1060 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: WARK05
Serial Number: 770
Issue Time: 2012 Apr 25 0547 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 769
Valid From: 2012 Apr 24 2351 UTC
Now Valid Until: 2012 Apr 25 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.


Space Weather Message Code: WARK04
Serial Number: 1919
Issue Time: 2012 Apr 25 0547 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1918
Valid From: 2012 Apr 23 1610 UTC
Now Valid Until: 2012 Apr 25 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.


Space Weather Message Code: ALTEF3
Serial Number: 1888
Issue Time: 2012 Apr 25 0234 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2012 Apr 25 0220 UTC
Station: GOES13
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTK05
Serial Number: 684
Issue Time: 2012 Apr 24 2356 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2012 Apr 24 2356 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.


Space Weather Message Code: WARK05
Serial Number: 769
Issue Time: 2012 Apr 24 2351 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2012 Apr 24 2351 UTC
Valid To: 2012 Apr 25 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.


Space Weather Message Code: WARK04
Serial Number: 1918
Issue Time: 2012 Apr 24 2040 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1917
Valid From: 2012 Apr 23 1610 UTC
Now Valid Until: 2012 Apr 25 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.


Space Weather Message Code: WATA20
Serial Number: 490
Issue Time: 2012 Apr 24 1400 UTC

WATCH: Geomagnetic A-index of 20 or greater predicted
NOAA Scale: Periods reaching the G1 (Minor) Level Likely
Valid for UTC Day: 2012 Apr 26
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.


Space Weather Message Code: WARK04
Serial Number: 1917
Issue Time: 2012 Apr 24 1157 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1916
Valid From: 2012 Apr 23 1610 UTC
Now Valid Until: 2012 Apr 24 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.


Space Weather Message Code: ALTTP2
Serial Number: 791
Issue Time: 2012 Apr 24 0842 UTC

ALERT: Type II Radio Emission
Begin Time: 2012 Apr 24 0748 UTC
Estimated Velocity: 1029 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.


Space Weather Message Code: WARK06
Serial Number: 194
Issue Time: 2012 Apr 24 0635 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2012 Apr 24 0650 UTC
Valid To: 2012 Apr 24 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.


Space Weather Message Code: WARK05
Serial Number: 768
Issue Time: 2012 Apr 24 0547 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 767
Valid From: 2012 Apr 23 1725 UTC
Now Valid Until: 2012 Apr 24 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.


Space Weather Message Code: WARK04
Serial Number: 1916
Issue Time: 2012 Apr 24 0547 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1915
Valid From: 2012 Apr 23 1610 UTC
Now Valid Until: 2012 Apr 24 1200 UTC
Warning Condition: Persistence
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.


Space Weather Message Code: WARK07
Serial Number: 37
Issue Time: 2012 Apr 24 0204 UTC

WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2012 Apr 24 0205 UTC
Valid To: 2012 Apr 24 0600 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater - Strong to Extreme
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.


Space Weather Message Code: ALTK06
Serial Number: 284
Issue Time: 2012 Apr 24 0047 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2012 Apr 24 0046 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.


Space Weather Message Code: WARK06
Serial Number: 193
Issue Time: 2012 Apr 23 2221 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2012 Apr 23 2230 UTC
Valid To: 2012 Apr 24 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.


Space Weather Message Code: WARK05
Serial Number: 767
Issue Time: 2012 Apr 23 2221 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 766
Valid From: 2012 Apr 23 1725 UTC
Now Valid Until: 2012 Apr 24 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.


Space Weather Message Code: WARK04
Serial Number: 1915
Issue Time: 2012 Apr 23 2221 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1914
Valid From: 2012 Apr 23 1610 UTC
Now Valid Until: 2012 Apr 24 0600 UTC
Warning Condition: Persistence
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.


Space Weather Message Code: ALTK05
Serial Number: 683
Issue Time: 2012 Apr 23 1937 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2012 Apr 23 1937 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.


Space Weather Message Code: ALTTP2
Serial Number: 790
Issue Time: 2012 Apr 23 1817 UTC

ALERT: Type II Radio Emission
Begin Time: 2012 Apr 23 1742 UTC
Estimated Velocity: 1605 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.


Space Weather Message Code: ALTK04
Serial Number: 1575
Issue Time: 2012 Apr 23 1803 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2012 Apr 23 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.


Space Weather Message Code: WARK05
Serial Number: 766
Issue Time: 2012 Apr 23 1725 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2012 Apr 23 1725 UTC
Valid To: 2012 Apr 23 2359 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.


Space Weather Message Code: WARK04
Serial Number: 1914
Issue Time: 2012 Apr 23 1722 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1913
Valid From: 2012 Apr 23 1610 UTC
Now Valid Until: 2012 Apr 24 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.


Space Weather Message Code: WARK04
Serial Number: 1913
Issue Time: 2012 Apr 23 1558 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2012 Apr 23 1610 UTC
Valid To: 2012 Apr 23 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.


Space Weather Message Code: WARK04
Serial Number: 1912
Issue Time: 2012 Apr 23 0756 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1911
Valid From: 2012 Apr 23 0327 UTC
Now Valid Until: 2012 Apr 23 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.


Space Weather Message Code: ALTK04
Serial Number: 1574
Issue Time: 2012 Apr 23 0552 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2012 Apr 23 0548 UTC
Synoptic Period: 0300-0600 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.


Space Weather Message Code: SUMSUD
Serial Number: 150
Issue Time: 2012 Apr 23 0335 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2012 Apr 23 0325 UTC
Deviation: 31 nT
Station: Boulder


Space Weather Message Code: WARK04
Serial Number: 1911
Issue Time: 2012 Apr 23 0327 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2012 Apr 23 0327 UTC
Valid To: 2012 Apr 23 0800 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.


Space Weather Message Code: WARSUD
Serial Number: 110
Issue Time: 2012 Apr 23 0244 UTC

WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2012 Apr 23 0314 UTC
Valid To: 2012 Apr 23 0344 UTC
IP Shock Passage Observed: 2012 Apr 23 0227 UTC


Space Weather Message Code: ALTTP4
Serial Number: 367
Issue Time: 2012 Apr 19 1155 UTC

ALERT: Type IV Radio Emission
Begin Time: 2012 Apr 19 1117 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.


Space Weather Message Code: ALTTP2
Serial Number: 789
Issue Time: 2012 Apr 19 1155 UTC

ALERT: Type II Radio Emission
Begin Time: 2012 Apr 19 1110 UTC
Estimated Velocity: 1031 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.


Space Weather Message Code: ALTTP4
Serial Number: 366
Issue Time: 2012 Apr 18 1817 UTC

ALERT: Type IV Radio Emission
Begin Time: 2012 Apr 18 1732 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.


Space Weather Message Code: ALTTP2
Serial Number: 788
Issue Time: 2012 Apr 18 1745 UTC

ALERT: Type II Radio Emission
Begin Time: 2012 Apr 18 1716 UTC
Estimated Velocity: 621 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.


Space Weather Message Code: ALTEF3
Serial Number: 1887
Issue Time: 2012 Apr 17 0501 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 1886
Begin Time: 2012 Apr 14 0300 UTC
Yesterday Maximum 2MeV Flux: 6527 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTEF3
Serial Number: 1886
Issue Time: 2012 Apr 16 0548 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 1885
Begin Time: 2012 Apr 14 0300 UTC
Yesterday Maximum 2MeV Flux: 7031 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTEF3
Serial Number: 1885
Issue Time: 2012 Apr 15 0601 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 1884
Begin Time: 2012 Apr 14 0300 UTC
Yesterday Maximum 2MeV Flux: 3922 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTEF3
Serial Number: 1884
Issue Time: 2012 Apr 14 1008 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 1883
Begin Time: 2012 Apr 14 0300 UTC
Yesterday Maximum 2MeV Flux: 2210 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTEF3
Serial Number: 1883
Issue Time: 2012 Apr 14 0315 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2012 Apr 14 0300 UTC
Station: GOES13
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.


Space Weather Message Code: ALTK04
Serial Number: 1573
Issue Time: 2012 Apr 14 0304 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2012 Apr 14 0256 UTC
Synoptic Period: 0300-0600 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.


Space Weather Message Code: WARK04
Serial Number: 1910
Issue Time: 2012 Apr 14 0240 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2012 Apr 14 0240 UTC
Valid To: 2012 Apr 14 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.


Space Weather Message Code: WARK04
Serial Number: 1909
Issue Time: 2012 Apr 13 0841 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1908
Valid From: 2012 Apr 12 1730 UTC
Now Valid Until: 2012 Apr 13 1900 UTC
Warning Condition: Persistence
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.


Space Weather Message Code: WARK05
Serial Number: 765
Issue Time: 2012 Apr 13 0236 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 764
Valid From: 2012 Apr 12 1945 UTC
Now Valid Until: 2012 Apr 13 0900 UTC
Warning Condition: Persistence
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.


Space Weather Message Code: ALTK05
Serial Number: 682
Issue Time: 2012 Apr 13 0234 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2012 Apr 13 0207 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.


Space Weather Message Code: WARK04
Serial Number: 1908
Issue Time: 2012 Apr 13 0156 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 1907
Valid From: 2012 Apr 12 1730 UTC
Now Valid Until: 2012 Apr 13 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.


Space Weather Message Code: WARK05
Serial Number: 764
Issue Time: 2012 Apr 12 2359 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 763
Valid From: 2012 Apr 12 1945 UTC
Now Valid Until: 2012 Apr 13 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.


Space Weather Message Code: WARK05
Serial Number: 763
Issue Time: 2012 Apr 12 1946 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2012 Apr 12 1945 UTC
Valid To: 2012 Apr 13 0000 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.


Space Weather Message Code: ALTK04
Serial Number: 1572
Issue Time: 2012 Apr 12 1909 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2012 Apr 12 1906 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.


Space Weather Message Code: WARK04
Serial Number: 1907
Issue Time: 2012 Apr 12 1730 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2012 Apr 12 1730 UTC
Valid To: 2012 Apr 13 0300 UTC
Warning Condition: Onset
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.


Space Weather Message Code: ALTTP2
Serial Number: 787
Issue Time: 2012 Apr 09 1324 UTC

ALERT: Type II Radio Emission
Begin Time: 2012 Apr 09 1228 UTC
Estimated Velocity: 767 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.


Space Weather Message Code: WARK04
Serial Number: 1906
Issue Time: 2012 Apr 07 1008 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2012 Apr 07 1008 UTC
Valid To: 2012 Apr 07 1900 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.


Space Weather Message Code: ALTTP4
Serial Number: 365
Issue Time: 2012 Apr 05 2158 UTC

ALERT: Type IV Radio Emission
Begin Time: 2012 Apr 05 2110 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.


Space Weather Message Code: ALTTP2
Serial Number: 786
Issue Time: 2012 Apr 05 2152 UTC

ALERT: Type II Radio Emission
Begin Time: 2012 Apr 05 2108 UTC
Estimated Velocity: 360 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.


Space Weather Message Code: ALTK04
Serial Number: 1571
Issue Time: 2012 Apr 05 0947 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2012 Apr 05 0947 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.


Space Weather Message Code: WARK04
Serial Number: 1905
Issue Time: 2012 Apr 05 0921 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2012 Apr 05 0921 UTC
Valid To: 2012 Apr 05 1600 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.