The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports:

Solar activity is still very weak — and should get weaker, at least until 2020, when we will probably reach the bottom of Solar Cycle 24. This week’s average sunspot number was 3.4, based on a sunspot number of 12 on August 14 and 15. Average solar flux edged down, from 69.7 to 68.7. Geomagnetic indicators were higher, with average daily planetary A index shifting from 5.7 to 6.9, and mid-latitude A index from 6.9 to 7.3.

Predicted solar flux is 69 on August 16-23; 70 on August 24 – September 5; 68 on September 6-18, and 70 on September 19-29.

Predicted planetary A index is 12, 15, 8, 5, 15, and 12 on August 16-21; 5 on August 22 – September 2; 12, 8, 5, 5, 10, 8, and 8 on September 3-9; 5 on September 10-11; 12, 15, 8, 5, 15, and 12 on September 12-17; 5 on September 18-28, and 8 on September 29.

Sunspot numbers for August 9 were 0, 0, 0, 0, 0, 12, and 12, with a mean of 3.4. The 10.7-centimeter flux was 70.3, 69.5, 67.4, 68.1, 67.8, 68.7, and 68.8, with a mean of 68.7. Estimated planetary A indices were 5, 4, 11, 5, 5, 4, and 14, with a mean of 6.9. Estimated mid-latitude A indices were 6, 4, 11, 6, 6, 6, and 12, with a mean of 7.3.

 

ARRL News Letter on Aug 16, 2018