Sunspots made a strong return this week -- and so did geomagnetic activity. The average daily solar flux increased 4.2 points to 79.6; on Wednesday, May 5, the daily sunspot number reached 77, the highest in nearly four years. The sunspot number hasn’t been as high since May 28, 2006, when it was 78. Sunspot numbers for April 29-May 5 were 0, 12, 13, 47, 61, 70 and 77, with a mean of 40. The 10...
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