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Propagation Forecast Bulletin #28 de K7RA:

from W1AW Bulletin via the ARRL on July 12, 2019
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Propagation Forecast Bulletin #28 de K7RA:

Propagation Forecast Bulletin 28 ARLP028
>From Tad Cook, K7RA
Seattle, WA July 12, 2019
To all radio amateurs

ARLP028 Propagation de K7RA

Like June 24 to 27, July 7 had a new spot from cycle 25, according to the magnetic signature. This week's brief appearance was last Sunday with a daily sunspot number of 12.

Average daily solar flux declined marginally from 67.5 to 67.1.

Predicted solar flux for the next 45 days is 67 on July 12 through August 25. That's right, 67 on every day.

Predicted planetary A index is 8 on July 12, 5 on July 13 to 15, then 12 and 8 on July 16 and 17, 5 on July 18 to 27, 8 on July 28, 5 on July 29 through August 4, then 12, 15 and 12 on August 5 to 7, 5 on August 8 to 23, 8 on August 24 and 5 on August 25.

Interesting article on space weather:

A recent video from Tamitha Skov:

OK1HH is taking a week off from his geomagnetic forecast, and will return next week.

On Thursday night as I put this bulletin to bed, I am enjoying monitoring remote receivers around the world, via . Currently listening to European CW traffic on 40 meters from a receiver in Ukraine.

If you would like to make a comment or have a tip for our readers, email the author at

For more information concerning radio propagation, see the ARRL Technical Information Service web page at, For an explanation of numbers used in this bulletin, see

An archive of past propagation bulletins is at More good information and tutorials on propagation are at

Monthly propagation charts between four USA regions and twelve overseas locations are at

Sunspot numbers for July 4 through 10, 2019 were 0, 0, 0, 12, 0, 0, and 0, with a mean of 1.7. 10.7 cm flux was 67.8, 67.5, 66.5, 67.3, 66.5, 66.8, and 67.6, with a mean of 67.1. Estimated planetary A indices were 5, 5, 3, 5, 9, 17, and 15, with a mean of 8.4. Middle latitude A index was 8, 6, 5, 5, 7, 16, and 13, with a mean of 8.6.

Source: W1AW Bulletin via the ARRL.

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