K7RA Solar Update

The following is quoted from ARRL News:

07/18/2019

Tad Cook, K7RA, Seattle, reports: Very low solar activity continues; there were no sunspots. Over the past week, average daily solar flux changed insignificantly, from 67.1 to 67. Average daily planetary A index changed from 8.4 to 5.9, while mid-latitude A index changed from 8.6 to 6.7. Conditions remain quiet. Predicted solar flux is 68 for July 18 – 24, and 67 for July 25 – August 31.

The predicted planetary A index is 5 on July 18 – 22; 8 on July 23; 5 on July 24 – 27; 8 on July 28; 5 on July 29 – August 3; 8, 15, 15, and 8 on August 4 – 7; 5 on August 8 – 10; 10, 12, and 8 on August 11 – 13; 5 on August 14 – 23; 8 on August 24; 5 on August 25 – 30, and 8 on August 31.

On July 17, Spaceweather.com reported a coronal hole spewing a stream of solar wind, with arrival expected to cause minor geomagnetic upset in the July 19 – 20 time frame. Spaceweather also reported that, so far this calendar year, 64% of all days were without sunspots. Last year the total percentage of spotless days was 61%, 28% in 2017, 9% in 2016, and nearly 0% in 2011 – 2015.

N4SO in Alabama reported some success on July 13 running FT8 with 15 W while testing a new antenna. He contacted stations in Texas, California, Arizona, Colorado, Utah, Oregon, and Guatemala.

On July 12, KD4SR reported contacting Puerto Rico, Haiti, Hawaii, Brazil, and Canada from central Florida on 6 meters, running FT8 and 100 W to modest antennas.

Sunspot numbers for July 11 – 17 were 0, 0, 0, 0, 0, 0, and 0, with a mean of 0. The 10.7-centimeter flux was 67.1, 66.8, 66, 67.2, 67.1, 67.2, and 67.8, with a mean of 67. Estimated planetary A indices were 8, 5, 6, 5, 7, 4, and 6, with a mean of 5.9. Middle latitude A index was 9, 5, 6, 6, 8, 5, and 8, with a mean of 6.7.

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.

A propagation bulletin archive is available. Monthly charts offer propagation projections between the US and a dozen DX locations.

Share your reports and observations.

Website: ARRL News

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