Subj : The K7RA Solar Update
To   : QST
From : ARRL de WD1CKS
Date : Thu Jan 21 2021 14:22:32

 01/21/2021 

We just witnessed 12 consecutive days with no sunspots, which many of us found
a bit unsettling. But fortunately Solar Cycle 25 activity returned with a new
sunspot on January 15.

Average daily sunspot number increased from zero last week, to 14.7 in the
January 14-20 reporting period.

Average daily solar flux rose from 73.8 to 76.1, and geomagnetic indicators
sank to very quiet levels. Average daily planetary A index dropped from 5.9 to
4, and average daily middle latitude A index from 4.4 to 3.

The outlook for the next month looks good. Predicted daily solar flux for the
next 30 days is 80 on January 21 - 28; 75 on January 29 - February 3; 76 for
February 4 - 10; 77 for February 11 -17, and 76 on February 18 - 19.

Predicted planetary A index is 14, 10, and 8 on January 21 - 23; 5 on January
24 - 25; 8 on January 26 - 28; 5 on January 29 - 31; 10 on February 1 - 2; 5 on
February 3 - 13; 10, 10, 12, and 10 on February 14 - 17, and 5 on February 18 -
19.

Sunspot numbers for January 14 - 20 were 0, 13, 15, 23, 13, 14, and 25, with a
mean of 14.7. The 10.7-centimeter flux was 73.6, 73.4, 77.7, 77.2, 75.3, 78.1,
and 77.2, with a mean of 76.1. Estimated planetary A indices were 2, 3, 4, 3,
4, 6, and 6, with a mean of 4. Middle latitude A index was 1, 2, 2, 2, 3, 6,
and 5, with a mean of 3.

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