Tad Cook, K7RA, Seattle, reports:

Sunspot Cycle 25 is under way! We saw one new spot on July 28 and two new ones on August 2 and 3. The August daily sunspot numbers were 22 and 23 on the dates of their appearance, and the total sunspot area grew on Wednesday to 160 millionths of the visible solar disc. The sunspot area has not been as large since May 2019, when it ranged from 140 to 410 millionths of the solar disc over a 2-week period.

The average daily sunspot number for July 30 to August 5 was 19.6, up from 14.1 over the previous 7 days. Average daily solar flux rose from 71.1 to 72.8 over the same period.

The planetary A index increased slightly, from 6.7 to 7, and the mid-latitude A index declined slightly, from 8.7 to 7.4.

Predicted solar flux is 73 on August 6 – 8; 71 on August 9 – 13; 69 on August 14 – 17; 71 on August 18 – 25; 73 on August 26 – 30; 71 on August 31 – September 7; 69 on September 8 – 13, and 71 on September 14 – 19.

The planetary A index forecast is 5 on August 6 – 7; 8 on August 8; 5 on August 9 – 23; 8 on August 24 – 25; 5 on August 26 – 28; 12, 8, and 8 on August 29 – 31, and 5 on September 1 – 19.

Frank Donovan, W3LPL, noted this week that August 5 marked ”the longest stretch of consecutive days with sunspots since September 2017, when there were 56 consecutive days. The next Solar Cycle 25 milestone will be an energetic sunspot region that increases the adjusted SFI to 80 or higher.”

WJ5O has an interesting history of 10-meter sporadic E and info on beacons.

Sunspot numbers for July 30 – August 5 were 22, 23, 22, 22, 23, 12, and 13, with a mean of 19.6. The 10.7-centimeter flux was 73.3, 72.3, 72, 72.7, 72.7, 73, and 73.4, with a mean of 72.8. Estimated planetary A indices were 4, 4, 3, 9, 16, 8, and 5, with a mean of 7. Middle latitude A index was 5, 5, 3, 9, 15, 9, and 6, with a mean of 7.4.

ARRL News Letter on August 6, 2020