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The K7RA Solar Update

ARRL

Well-Known Member
Nov 15, 2008
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We've now observed sunspots continuously for the past 30 days -- certainly a turnaround from the quiet conditions of the past few years. In fact, in 10 weeks, we have seen only three days with no sunspots: December 25, January 6 and January 19. This is a little more than 4 percent no-sunspot days, a nice contrast with all of 2009, with more than 71 percent days with no sunspots. Sunspot numbers for February 11-17 were 64, 38, 37, 28, 27, 28 and 49, with a mean of 38.7. The 10.7 cm flux was 94.2, 95.5, 94.1, 89.4, 87.6, 86.8 and 86.9, with a mean of 90.6. The estimated planetary A indices were 5, 6, 3, 4, 14, 9 and 4, with a mean of 6.4. The estimated mid-latitude A indices were 4, 4, 2, 3, 8, 11 and 2 with a mean of 4.9. Since the first of the year, the average weekly sunspot numbers were 14.6, 26.4, 18.6, 28, 14.6, 43.3 and 38.7.



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