K7RA Solar Update

The following is quoted from ARRL News:

08/15/2019

Tad Cook, K7RA, Seattle, reports: No sunspots were visible over the August 8 – 14 reporting week. Spaceweather.com says 67% of days so far this year have been spotless. For all of 2018, it was 61%. At solar minimum in 2008 and 2009, spotless days ran 73% and 71%, respectively.

Solar flux has been minimal, unremarkable, and barely changed — edging up from 67.2 to 67.4. Predicted solar flux for the next 45 days is also unremarkable, at 67 for August 15 – September 28.

Predicted planetary A index is 5 on August 15; 8 on August 16; 5 on August 17 – 18; 8 on August 19; 5 on August 20 – 25; 8 on August 26 – 28; 5 on August 29 – 31; 38 and 14 on September 1 – 2; 5 on September 3 – 5; 8 on September 6 – 8; 5 on September 9 – 11; 8 on September 12; 5 on September 13 – 21; 8 on September 22 – 24; 5 on September 25 – 27, and — in a reoccurrence of geomagnetic activity reported last week and also predicted for September 1 — 38 on September 28.

In Friday’s bulletin, look for reports on recent 10-meter propagation.

Sunspot numbers for August 8 – 14 were 0, 0, 0, 0, 0, 0, and 0, with a mean of 0. The 10.7 centimeter flux was 68.6, 67.2, 67.2, 67.6, 67.2, 66.8, and 67.4, with a mean of 67.4. Estimated planetary A indices were 7, 6, 8, 6, 5, 7, and 5 with a mean of 6.3. The middle latitude A index was 6, 7, 8, 7, 7, 8, and 5, with a mean of 6.9.

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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