2-3-22 Solar Report

Tad Cook, K7RA, Seattle, reports: Our sun was much more active over the past week, with the average daily sunspot number more than doubling from 39.6 in the previous week to 81.3 in the current January 27 – February 2 reporting period.

Geomagnetic indicator average daily Planetary A index rose from 8.3 to 10.1, while average middle latitude A index was unchanged at 6.4.

Predicted solar flux for the near term is 130 on February 3 – 4; 125 on February 5 – 6; 120 on February 7 – 8; 118 on February 9 – 10; 128 on February 11 – 12; 125 on February 13 – 14; 120 on February 15 – 17; 128 on February 18 – 21; 125 on February 22 – 25; 128 on February 26; 132 on February 27 – 28; 135 on March 1 – 3; 125 on March 4 – 7, and 128 on March 8 – 11.

Predicted planetary A index is 10, 6, 12, 14, and 8 on February 3 – 7; 5 on February 8 – 9; 12 and 8 on February 10 – 11; 5 on February 12 – 16; 10, 12, 8, and 5 on February 17 – 20; 10, 8, 5, and 8 on February 21 – 24; 12, 8, 5, and 8 on February 25 – 28; 10, 5, and 5 on March 1 – 3; 20 and 12 on March 4 – 5; 5 on March 6 – 8; 12 and 8 on March 9 – 10, and 5 on March 11 – 15.

An interesting new Solar Cycle 25 update is available, thanks to K9LA and K1HTV.

Sunspot numbers for January 27 – February 2 were 85, 77, 74, 70, 100, 88, and 75, with a mean of 81.3. The 10.7-centimeter flux was 107.1, 113.4, 125.3, 129.6, 129.5, 128.6, and 128.2, with a mean of 123.1. Estimated planetary A indices were 7, 8, 17, 10, 10, 7, and 12, with a mean of 10.1. Middle latitude A index was 5, 5, 7, 7, 3, 10, and 8, with a mean of 6.4.

A comprehensive K7RA Solar Update is posted Fridays on the ARRL website. For more information concerning radio propagation, visit the ARRL Technical Information Service, read “What the Numbers Mean…,” and check out the Propagation Page of Carl Luetzelschwab, K9LA.

A propagation bulletin archive is available. For customizable propagation charts, visit the VOACAP Online for Ham Radio website.

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