Thursday, February 27, 2014

Impact from X5 Solar Flare is here! S1 Radiation Storm continues


CME IMPACT, CHANCE OF STORMS: An interplanetary shock wave hit Earth's magnetic field today at approximately 1645 UT (11:45 AM EST). This is the expected glancing blow from the CME produced by the X4.9-class solar flare of Feb. 25th. Polar geomagnetic storms and auroras are possible in the hours ahead. Stay tuned for updates


CME Impact Detected / Storm Watch
A geomagnetic sudden impulse measuring 22 nT was detected at 16:53 UTC by ground based magnetometers. This signals the moment an expected plasma cloud (CME) swept past our planet. Solar wind speeds increased to above 430 km/s and the Bz/IMF component is currently variable. A noteworthy rise in plasma density was also observed. Increased geomagnetic activity will be possible during the hours ahead. Stay tuned for updates.
Update: The Bz component of the interplanetary magnetic field (IMF) is now pointed sharply south (-18 nT). This could help intensity geomagnetic activity in the wake of the earlier CME impact. The solar wind speed remains near 450 km/s.
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2014 Feb 27 1805 UTC
Valid To: 2014 Feb 27 2200 UTC
Warning Condition: Onset
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.
SUMMARY: Geomagnetic Sudden Impulse
Observed: 2014 Feb 27 1653 UTC
Deviation: 22 nT
Station: HAD

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