Tad Cook, K7RA, of Seattle, Washington, reports ARRL Propagation Bulletin ARLP001 for January 5, 2023:
Two new sunspot groups emerged on December 29, 2022, one more on December 30, 2022, and another on January 1, 2023.
Solar activity was a little higher, with average daily sunspot numbers rising from 96.1 to 97, and solar flux averages rose 14 points to 157.8.
Predicted solar flux is 152 and 154 on January 5 – 6; 152 on January 7 – 8; 150, 148, and 146 on January 9 – 11; 150 on January 12 – 13; 145 on January 14; 140 on January 15 – 16; 145 on January 17 – 19; 150 and 155 on January 20 – 21; 160 on January 22 – 23; 165 on January 24 – 26; then 160, 155, 155, 158, and 155 on January 27 – 31.
Predicted planetary A index is 18, 12 and 10 on January 5 – 7; 5 on January 8 – 16; 8, 12, 25, 20, and 10 on January 17 – 21; 5 on January 22 – 24; 8, 28, 15, and 10 on January 25 – 28; 5 on January 29 – 30, and 18 on January 31 – February 1.
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Sunspot numbers for December 29, 2022, through January 4, 2023, were 113, 121,
82, 94, 94, 89, and 86, with a mean of 97. The 10.7-centimeter flux was 162.8,
178.3, 164.9, 152.6, 146.4, 148.5, and 151, with a mean of 157.8. Estimated
planetary A indices were 11, 31, 16, 14, 8, 7, and 21, with a mean of 15.4.
Middle latitude A index was 8, 22, 10, 9, 5, 5, and 17, with a mean of 10.9.
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A comprehensive K7RA Solar Update is posted on 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.
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