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The K7RA Solar Update

Discussion in 'ARRL Updates' started by ARRL, Feb 27, 2010.

  1. ARRL

    ARRL Well-Known Member

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    Two new sunspot groups -- 1050 and 1051 -- appeared on February 23 and 24. We've now seen 38 continuous days with sunspots (including today); the last time there were no sunspots for two or more days in a row was back on November 23-December 8 when we saw 16 days with no sunspots. If sunspots continue through Sunday (they will!), February will be the first calendar month since January 2007 with sunspots every day. Sunspot numbers for February 18-24 were 17, 23, 19, 17, 14, 31 and 40, with a mean of 23. The 10.7 cm flux was 85, 83.7, 83.8, 83.5, 83.7, 84.2 and 82.6, with a mean of 83.8. The estimated planetary A indices were 4, 3, 1, 1, 4, 2 and 3, with a mean of 2.6. The estimated mid-latitude A indices were 2, 3, 0, 3, 3, 2 and 2, with a mean of 2.1.



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