This reporting week, May 11 – 17, the average daily sunspot number was marginally lower at 118.6 compared to 119.3 last week.
The average daily solar flux dropped from 167.8 to 143.2.
Geomagnetic indicators were quieter, with both planetary and middle latitude A index at 9.6. Last week the two numbers were 15.1 and 11.9.
10.7-centimeter solar flux is forecast to peak at 165 on June 8.
The predicted solar flux numbers are 140 and 138 on May 18 – 19; 135 on May 20 – 21; 130 on May 22 – 24, then 154, 140, and 145 on May 25 – 27; 155 on May 28 – 30; 160 on May 31 and June 1; 155 on June 2 – 3; 160 on June 4 – 7, then 165, 160, 150, 145, and 150 on June 8 – 12, then 155 on June 13 – 17.
Predicted planetary A index is 5 on May 18 – 19; 8 on May 20 – 21; 5 on May 22 – 23, then 12, 15, and 15 on May 24 – 26; 10, 10, and 8 on May 27 – 29; 5 on May 30 through June 1, then 16, 12, 16, and 12 on June 2 – 5; 8 on June 6 – 8, and 5 on June 9 – 18.
Check out NASA’s sunspot picture from May 17 at https://bit.ly/458DrPw.
Check out a video of the recent solar eruption at https://www.youtube.com/watch?v=Rm7M5pqjCgY.
Read about how the solar flare caused a radio blackout at https://bit.ly/434c5bw.
Read about a solar storm threat at https://bit.ly/3pSK4p2.
Sunspot numbers for May 11 through 17, 2023, were 152, 134, 120, 109, 103, 106, and 106, with a mean of 118.6. 10.7-centimeter flux was 163.4, 149.1, 143.8, 139.7, 134.5, 134.3, and 137.9, with a mean of 143.2. Estimated planetary A indices were 9, 19, 13, 8, 6, 8, and 4, with a mean of 9.6. Middle latitude A index was 10, 15, 12, 9, 6, 10, and 5, with a mean of 9.6.