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The K7RA Solar Update

Discussion in 'ARRL Updates' started by ARRL, Dec 7, 2018.

  1. ARRL

    ARRL Well-Known Member

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    After nine days with no sunspots, sunspot group 2729 emerged on December 5. The sunspot number on that date was 16. Average daily solar flux for the week was 68.9, unchanged from last week. On Thursday, December 6 the appearance of 2729 continued, with a sunspot number of 17 and the sunspot area increasing from 30 to 50 millionths of a solar hemisphere.



    Average daily planetary A index rose from ...

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    #1 ARRL, Dec 7, 2018
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