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The K7RA Solar Update

Discussion in 'ARRL Updates' started by ARRL, Jun 8, 2018.

  1. ARRL

    ARRL Well-Known Member

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    Tad Cook, K7RA, Seattle, reports: Sunspots vanished again after appearing on every day, from May 21 through June 4. Average daily sunspot numbers for the May 31 through June 6 reporting week dropped from 26.3 to 12.9.


    Average daily solar flux declined from 74.9 to 73.2. Average planetary A index increased from 3.9 to 11.7 while average mid-latitude A index increased from 4.7 to 10.4.


    Predicted s...

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