Wednesday, April 25, 2012

CME Arrival / Geomagnetic Storm

     The CME that erupted on April 23, 2012 along with the C2.0 solar Flare from plage Region 1461 (N10W19),(link to "Earth Directed Full Halo CME" report), has arrived and is stirring up a NOAA scale G1, geomagnetic storm with solar winds near the 700km/s range. In the first image to the left we can see the drop in the electron flux as measured by the GOES satellites upon  arrival. In the second image we see the deviation in the Boulder, CO magnetometer at the onset of this CME.

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.

Continue to check back for updates as the storm progresses.

                                            UPDATE April 26 2012, 04:00 UTC

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.


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