Sunspot activity dropped dramatically this week, with only two new sunspot groups emerging on October 14 and 16.
Compared to last week, the average daily sunspot number slipped from 144.1 to 89.4, and the average daily solar flux dropped from 159.1 to 145.1.
Average daily planetary A index changed from 7.6 to 6.4, and the average daily middle latitude A index went from 8.3 to 5.
Predicted solar flux is 135 on October 19 – 20; 140 on October 21 – 26; 145 on October 27 – 28; 150 on October 29 – November 5; 140 on November 6 – 9; 135 on November 10 – 11; 145 and 140 on November 12 – 13; 135 on November 14 – 15, and 140 on November 16 – 18.
Predicted planetary A index is 18, 22, 24, 8, 10, and 8 on October 19 – 24; 5 on October 25 – 26; 8 on October 27 – 30; 10 and 12 on October 31 – November 1; 5 on November 2 – 8; 12 on November 9 – 10; 5 on November 11 – 12; 12 on November 13 – 14, and 10 and 8 on November 15 – 16.
See
a report about a possible October 19 geomagnetic storm at https://bit.ly/3rQaZDk.
Sunspot numbers for October
12 – 18, 2023, were 126, 91, 100, 92, 106, 57, and 54, with a mean of 89.4. The
10.7-centimeter flux was 157.1, 149, 148.2, 144.6, 144, 137.3, and 135.3, with
a mean of 145.1. Estimated planetary A indices were 4, 13, 8, 4, 4, 3, and 9,
with a mean of 6.4. Middle latitude A index was 3, 11, 6, 2, 3, 2, and 8, with
a mean of 5.