02/20/2014 @ 05:35 UTC
Here we go again. An interplanetary shockwave was observed sweeping past the ACE spacecraft on Wednesday evening at 02:55 UTC. The solar wind speed is currently reaching above 700 km/s at times. The Bz component of the interplanetary magnetic field (IMF) is pointing south (-10 nT). A geomagnetic sudden impulse measuring 31 nT was detected by the magnetometer located in Boulder, Colorado at 03:29 UTC. The signals the passage of an earlier than expected interplanetary shock past our planet. Sky watchers at high latitudes should remain alert for visual aurora. A Moderate G2 level geomagnetic stormwas observed at high latitudes. Kevin Sharman located in British Columbia, Canada captured a nice green aurora glow on Wednesday evening following the CME impact.
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2014 Feb 20 0528 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.
SUMMARY: Geomagnetic Sudden Impulse
Observed: 2014 Feb 20 0329 UTC
Deviation: 31 nT