Solar activity was down again this week, with average daily sunspot numbers dropping from 105.9 to 78.7, and the average daily solar flux dropping from 149.4 to 140.9. Only three sunspot groups appeared, occurring on August 25, 28, and 30.
There has been a gradual transition from summer to fall conditions, with 10 and 12 meters opening more frequently. The autumnal equinox is only 3 weeks away.
Geomagnetic indicators were a little lower. The average planetary A index went from 8.4 to 7, and average middle latitude numbers went from 10.1 to 8.9.
Predicted solar flux shows a peak around 168 on September 18 – 21.
Forecast values are 145 on August 31 through September 1; 150, 150, and 145 on September 2 – 4; 150 on September 5 – 6; 156 on September 7 – 8; 150 on September 9; 147 on September 10 – 11; 145, 150, 155, 150, 155, and 160 on September 12 – 17; 168 on September 18 – 21; 165, 160, and 148 on September 22 – 24; 150 on September 25 – 26, and 152, 150, 145, and 140 on September 27 – 30.
Predicted planetary A index is 5, 10, and 10 on August 31 through September 2; 5 on September 3 – 6; 8 on September 7 – 8; 5 on September 9 – 13; 12, 10, 10, and 8 on September 14 – 17; 5 on September 18 – 22; 10, 10, and 8 on September 23 – 25, and 5 on September 26 to October 2.
Read about India’s solar mission at https://bit.ly/3PiPJ1N.
Check
out a video about solar flares at https://bit.ly/47X6gzC.
Sunspot numbers for August
24 through 30, 2023, were 86, 77, 75, 69, 68, 82, and 94, with a mean of 78.7.
The 10.7-centimeter flux was 144.1, 138.9, 139.3, 141.5, 141.7, 142.2, and
138.6, with a mean of 140.9. Estimated planetary A indices were 9, 5, 7, 11, 6,
5, and 6, with a mean of 7. The middle latitude A index was 9, 7, 9, 13, 8, 7,
and 9, with a mean of 8.9.