Sunspot 1540 produced a long duration M1.0 solar flare....
WEBSITE: thewatchers.adorraeli.com
by: Chillymanjaro
GOES xray flux chart: NOAA/SWPC, Boulder, Co
http://thewatchers.adorraeli.com/2012/08/11/sunspot-1540-produced-a-long-dura...
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