K7RA Solar Update

The following is quoted from ARRL News:

04/23/2019

Tad Cook, K7RA, Seattle, reports: May 18 was the last day we saw sunspot activity, after more than 2 weeks with sunspots visible daily. The average daily sunspot number declined to 5.3 this week from 22.7 the previous week. Average daily solar flux declined from 75.7 to 69.8. Geomagnetic conditions were quieter, with the average daily planetary A index declining from 13 to 5.

Predicted solar flux over the next 45 days is 68 on May 23 – 27; 70 on May 28 – 30; 72 on May 31; 74 on June 1; 76 on June 2 – 10; 74 on June 11; 72 on June 12 – 13; 70 on June 14 – 15; 69 on June 16 – 17; 68 on June 18; 67 on June 19 – 25; 70, 72, and 74 on June 26 – 28, and 76 on June 29 – July 6.

Predicted planetary A index is 5 on May 23 – 24; 8 on May 25; 5 on May 26 – 27; 10; 8; 8 and 10 on May 28 – 31; 5 on June 1 – 15; 8 on June 16 – 18; 5 on June 19 – 23; 10, 12, 8, and 10 on June 24 – 27, and 5 on June 28 – July 6.

On May 20, Markus Hansen, VE7CA, wrote to say he’s been hearing many 10-meter beacons from California, and one from Utah.

Sunspot numbers for May 16 – 22 were 13, 13, 11, 0, 0, 0, and 0, with a mean of 5.3. The 10.7-centimeter flux was 73.6, 72.1, 70.6, 68, 68.7, 68, and 67.3, with a mean of 69.8. Estimated planetary A index was8, 5, 5, 3, 6, 4, and 4, with a mean of 5. The mid-latitude A index was 9, 7, 8, 3, 7, 4, and 5, with a mean of 6.1.

A comprehensive K7RA Solar Update is posted Fridays on the ARRL website. For more information concerning radio propagation, visit the ARRL Technical Information Service, read “What the Numbers Mean…,” and check out K9LA’s Propagation Page.

Website: ARRL News

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