The K7RA Solar Update

ARRL Headquarters is closed for Good Friday on April 18, so the bulletin comes to you a day early.

After a few days in the doldrums on April 8-13 with sunspot numbers in the double digits, solar activity made a strong recovery over the following three days, with daily sunspot numbers of 105, 149 and 245. Sunspot numbers have reached this level several times in the past 12 months. On February 28,…

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