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The K7RA Solar Update

ARRL

Well-Known Member
Nov 15, 2008
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Two new sunspot groups appeared on March 1, numbered 1052 and 1053. The total number of sunspot groups appearing over the last month is 11. Looking at our 3-month moving average of daily sunspot numbers, the latest for December-January-February is 22.4, for the period centered on January. The average daily sunspot number for the month of February was 31. The fact that this is higher than the latest 3-month average is a welcome trend. The current 3-month average centered on January 2010 is very close to the 3-month average centered on January 2007, which was 22.7. That moving average has not been as high since. In fact, the closest it has been was February 2007, at 18.5. It was all downhill from there, and that average was below 10 from September 2007-October 2009. It now looks like we saw three minimums, which is why it was so easy to err when trying to locate the bottom. Several times we hit some low number, decided that things were improving, and then a few months later hit it again.



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