An interplanetary shock wave from yesterday's CME hit Earth's geomagnetic field at 20:23 UTC today. At the time, Boulder station measured magnetic field Bz component deviation of 62 nT. A G1 (minor) geomagnetic storm is currently underway. High latitude sky watchers should be alert for auroras.
Area of impact is primarily poleward of 60 degrees Geomagnetic Latitude, weak power grid fluctuations can occur, minor impact on satellite operations are possible.
Aurora may be visible at high latitudes.
Space Weather Message Code: SUMSUD
Serial Number: 180
Issue Time: 2013 Oct 08 2036 UTC
SUMMARY: Geomagnetic Sudden Impulse
Observed: 2013 Oct 08 2023 UTC
Deviation: 62 nT
Space Weather Message Code: ALTK05
Serial Number: 730
Issue Time: 2013 Oct 08 2033 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2013 Oct 08 2024 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.
Featured image credit: SOHO
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