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The K7RA Solar Update

ARRL

Well-Known Member
Nov 15, 2008
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We've seen average daily sunspot numbers for this reporting week. Since last Thursday through Wednesday this week, the numbers rose more than 9 points to 28; the average solar flux slipped more than 2 points to 81.9. Geomagnetic indices were a tiny bit lower. Sunspot numbers for January 21-27 were 17, 30, 40, 32, 34, 28 and 15, with a mean of 28. The 10.7 cm flux was 82.6, 82.4, 84.6, 84.6, 81.2, 79.8 and 77.8, with a mean of 81.9. The estimated planetary A indices were 4, 2, 4, 4, 3, 3 and 2, with a mean of 3.1. The estimated mid-latitude A indices were 4, 2, 4, 2, 3, 1 and 0, with a mean of 2.3. The predicted solar flux for January 29-31 is 76, 80 on February 1-2, 82 on February 3-5 and 88-89 for the following five days. We don't see any geomagnetic upset predicted until February 16, with the planetary A index only rising to 10, which is hardly an upset.



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