[Propagation] Biggest X-ray Flare yet, Sunspot Cycle 24 (X7 Aug 9 2011)

["Tomas Hood" <nw7us@hfradio.org>]

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At 0805 UTC, 9 August 2011, the Sun erupted with an X6.9 (X7) X-ray flare.  
This is the largest yet in Sunspot Cycle 24.  This caused an R3-level  
radio blackout on the sunlit side of Earth, and, pushed the Earth into an  
S1-level solar radiation storm that triggered a polar cap absorption event  
(PCA).  Propagation over the polar regions is suffering as a result.

Here is a High Definition movie of the X7 flare:

<http://www.youtube.com/watch?v=58KBUduxKCI>

73 de NW7US / Tomas David Hood
Hamilton, Montana <http://nw7us.us/>

Contributing editor, Propagation Columns:
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