Tad Cook, K7RA, Seattle, reports: Solar activity increased over the past week, with average daily sunspot numbers up from 5.4 to 20, and average daily solar flux rallying from 69.9 to 73.4.  The previous week saw 4 days with no sunspots, but this week had sunspots on every day. New sunspot groups emerged on April 19 and 21.

Predicted solar flux is 71 on April 26-29; 70 on April 30-May 16; 75 on May 17-29, and 70 on May 30-June 9.  Predicted planetary A index is 8 and 12 on April 26-27; 5 on April 28-May 1; 8 on May 2; 5 on May 3-5; 10, 15, 12, 10, and 8 on May 6-10; 5 on May 11-16; 42, 12, and 8 on May 17-19; 5 on May 20-22; 8 and 12 on May 23-24; 5 on May 25-June 1; 10, 15, 12, 10, and 8 on June 2-6, and 5 on June 7-9.

Sunspot numbers for April 19-25 were 14, 14, 34, 20, 22, 19, and 17, with a mean of 20. The 10.7-centimeter flux was 70.8, 73, 76.8, 75.7, 73.9, 72.9, and 70.8, with a mean of 73.4. Estimated planetary A indices were 3, 47, 12, 5, 6, 5, and 5, with a mean of 11.9. Estimated mid-latitude A indices were 2, 29, 10, 5, 6, 4, and 4, with a mean of 8.6.

Send me your reports or observations.

Source: ARRL Letter