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Tad Cook, K7RA, Seattle, reports: There were no zero-sunspot days over the December 21-27 reporting week. Then, on Thursday, December 28, no sunspots were visible. So far in 2017, there have been 102 days with no sunspots, or 28%.
The average daily sunspot number was 17.4, up from 2.3 over the previous 7-day reporting period. The previous week had such a low average because only 1 day out of tha...
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