The K7RA Solar Update

Tad Cook, K7RA, Seattle, reports:

Weak solar activity continues, with sunspots returning on May 4-14, then departing again. From May 3 to May 9, the average daily sunspot number declined from 14.6 to 6.4, while average daily solar flux increased from 68.3 to 70.2.
Earlier in the week, geomagnetic indicators showed unrest from a solar wind stream. The average daily planetary A index declined to 8.4 in this reporting week compared to 15.1 over the previous 7 days. The mid-latitude A index declined from 11.7 to 9.
Predicted solar flux is 70 on May 17-20; 69 on May 21-23; 70 on May 24-29; 68 on May 30 – June 2; 70 on June 3-8; 71 on June 9-14; 70 on June 15-25; 68 on June 26-29, and 70 on June 30.
Predicted planetary A index is 18, 14, and 8 on May 17-19; 5 on May 20-31; 18 and 28 on June 1-2; 16 on June 3-4; 14, 12, and 8 on June 5-7; 5 on June 8-12; 18, 15, and, 10 on June 13-15; 5 on June 16-27, and 18, 28, and 16 on June 28-30.
Sunspot numbers for May 10 – 16 were 11, 11, 12, 11, 0, 0, and 0, with a mean of 6.4. The 10.7-centimeter flux was 69.6, 70.3, 69.8, 70.9, 70.3, 70.3, and 69.9, with a mean of 70.2. Estimated planetary A indices were 12, 16, 10, 8, 5, 4, and 4, with a mean of 8.4. Estimated mid-latitude A indices were 11, 19, 10, 10, 5, 5, and 3, with a mean of 9.

ARRL News Letter on May 17, 2018