[HCDX] Superflare in region 10486

["Jan Alvestad" <janalv@xxxxxxxxxx>]

This is a copy of an update I just posted in STAR
(Solar Terrestrial Activity Report - http://www.dxlc.com):

"Region 10486 was the source of a major M8.4 long duration event peaking
at 10:48 UTC. This event occurred in the eastern part of the region and
may have triggered a superflare in the remainder of the region, this flare
peaked at 11:10 UTC. The superflare peaked at the class X18 level which
makes it the second largest flare during cycle 23. The event is likely to
be associated with an enormous earth directed CME. The CME will likely reach
the Earth sometime between 8 and 17 UTC on October 29. This will be a direct
hit and extremely severe geomagnetic storming is possible."

Further updates will be posted during the day.


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