Tuesday, April 24, 2012
Geomagnetic Storm G2 and Mid Latitude Aurora
A Geomagnetic Storm, NOAA Sclae G2 Moderate Kp=6, causing a Mid Latitude Aurora, continues due to the arrival of a CME that lifted off the solar disk on April 19th. Solar wind velocities increased from 350 - 400 km/s. For the original post on the origins of this CME, read the original post here: CME arrival soon and sunspot update . The CME arrived with a Geomagnetic Sudden Impulse that was observed by NOAA at the Boulder CO magnetometer with a deviation of 31 nT at 03:23 UTC on April 23.
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.