The K7RA Solar Update

As promised in the April 19th edition of The ARRL Letter, this week’s bulletin features a report on recent solar activity and solar cycle progression from Carl Luetzelschwab, K9LA.

Both the solar flux and sunspot numbers reached a short term low on April 8-11, but they are now rising again. For the past week — April 12-18 — the average daily sunspot numbers more than doubled, compared to the p…

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