Solar Conditions from K7RA

The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports: Sunspot numbers and solar flux made a strong comeback during the March 30-April 5 reporting week. The average daily solar flux was 96.5 — up from 77.9 over the reporting week and 71.2 the previous week. The average daily sunspot number progressed from 3.4 to 29.7 to 65.9 over the same 3 weeks.

The latest daily forecast for Planetary A index and solar flux from NOAA and USAF (updated daily) shows solar flux at 85, 80, and 75 on April 6-8; 70 on April 9-10; 75 on April 11-14; 78 on April 15-16; 85 on April 17-19; 72 on April 20-23; 88 on April 24-27; 85 on April 28-29; 105 on April 30; 100, 97, 92, 85, and 80 on May 1-5; 75 on May 6-7; 78 on May 8-9; 75 on May 10-11; 78 on May 12-13; 85 on May 14-16, and 92 after that, out to 45 days from now.

Predicted planetary A index will be 8 on April 6-8; 5, 8, 10, and 8 on April 9-12; 5 on April 13-16; 20, 18, and 10 on April 17-19; 5 on April 20-22; 55, 28, 20, 22, and 28 on April 23-27; 15, 10, 8, 7, and 6 on April 28-May 2; 5 on May 3-13, 20, 18, and 10 on May 14-16; 5 on May 17-19, and 55 on May 20.

Sunspot numbers for March 30 through April 5, 2017 were 33, 65, 79, 75, 97, 75, and 37, with a mean of 65.9. The 10.7-centimeter flux was 85.9, 90.6, 101, 112, 107.9, 93.8, and 84.6, with a mean of 96.5. Estimated planetary A indices were 23, 28, 16, 8, 4, 20, and 10, with a mean of 15.6. Estimated mid-latitude A indices were 18, 21, 15, 6, 4, 17, and 10, with a mean of 13. (Click on the solar disk image for a closer look at sunspots AR2644 and 2645.)