Sunday's CME sparked moderate (G2) geomagnetic storming

A G2 geomagnetic storm is now in progress following CME impact on Earth's magnetic field early on October 2, 2013. The ACE spacecraft detected a solar wind increase to above 600 km/s and the Bz component (IMF) initially tipped sharply south to -19nT. Interplanetary shock passage was detected by Boulder, Colorado magnetometer at 01:58 UTC.

This CME arrived a little before its schedule and it quickly sparked minor G1 geomagnetic storm which strengthened to moderate G2 levels in couple of hours. 

Area of impact is primarily poleward of 55 degrees Geomagnetic Latitude.​ Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.​ HF (high frequency) radio propagation can fade at higher latitudes. Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.​ Aurora may be seen as low as New York to Wisconsin to Washington state.​

High latitude sky watchers should be alert for auroras. Send us some pictures so we could all enjoy.

Space Weather Message Code: SUMSUD
Serial Number: 179
Issue Time: 2013 Oct 02 0212 UTC

SUMMARY: Geomagnetic Sudden Impulse
Observed: 2013 Oct 02 0158 UTC
Deviation: 72 nT
Station: BOU

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Space Weather Message Code: ALTK06
Serial Number: 313
Issue Time: 2013 Oct 02 0458 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2013 Oct 02 0454 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.