This week, September 1 – 7, 2022, two new sunspot groups emerged on September 1, two more on September 2, one more on September 5, another on September 6, and one more on September 7.
But average daily sunspot numbers declined from 74.9 to 68, while average daily solar flux rose from 123.8 to 125.8.
Geomagnetic indicators were way up, and the average daily planetary A index rose from 10.1 to 24.6, while middle latitude numbers increased from 9.4 to 17.4.
September 4 was the most active day, with the planetary A index being 64. On that day, the college A index in Fairbanks, Alaska, was 91!
Predicted solar flux is 125 on September 8 – 14; 126 on September 15; 125 on September 16 – 17; 126 and 120 on September 18 – 19; 125 on September 20 – 21; 115 on September 22 – 24; 120 on September 25 – 28; 118 on September 29 – 30; 115 and 125 on October 1 – 2; 120 on October 3 – 4; 122 on October 5; 120 on October 6 – 7; and 125 on October 8 – 11.
Predicted planetary A index is 50 on October 1! Otherwise, 10 on September 8; 8 on September 9 – 11; 5 on September 12; 20 on September 13 – 14; 10 on September 15; 8 on September 16 – 17; 5 on September 18 – 22; 12 and 10 on September 23 – 24; 14 on September 25 – 27; 8 on September 28 – 29; 22, 50, 25, 16, 12, and 10 on September 30 through October 5; 8 on October 6 – 8, and 5, 12, and 15 on October 9 – 11.
Sunspot numbers for September 1
through 7 were 67, 71, 68, 62, 79, 56, and 73, with a mean of 68. The
10.7-centimeter flux was 116.3, 129.8, 123.4, 128.3, 130.2, 126.2, and 126.1,
with a mean of 125.8. Estimated planetary A indices were 9, 8, 25, 64, 32,
20, and 14, with a mean of 24.6. Middle latitude A index was 9, 10, 23, 33,
21, 14, and 12, with a mean of 17.4.
Send your tips, questions,
or comments to k7ra@arrl.net.
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.