[Propagation+Space Weather] The W1AW Weekly Propagation Report - 2020 Jul 07 20:19 UTC

[nw7us@sunspotwatch.com]

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The following is the weekly propagation bulletin from W1AW / ARRL (posting on 20200707 20:19 UTC):

QST de W1AW Propagation Forecast Bulletin 27 ARLP027 >From Tad Cook, K7RA Seattle, WA July 7, 2020 To all radio amateurs

SB PROP ARL ARLP027 ARLP027 Propagation de K7RA

No sunspots this week. The pattern persists, and this surprises me. But Spaceweather.com reported a couple of weak, barely emerging spots, never numbered, and by their magnetic polarity were from new Solar Cycle 25.

We rely on NOAA for official sunspot numbers, and the most recent one reported was 11 on June 15. See, ftp://ftp.swpc.noaa.gov/pub/indices/DSD.txt

Average daily solar flux over the recent reporting week (June 25 to July 1) averaged 68.6 up from 67.7 over the previous seven days. Average daily planetary A index was 4.7, the same as the average middle latitude A index.

Predicted solar flux over the next 45 days is 68, every day July 3 to August 16, which is hardly a promising outlook. Even with no sunspots, it would be nice to see solar flux values north of 70.

Predicted planetary A index is 5 on July 3-26, 8 on July 27-28, 5 on July 29 through August 1, 8 on August 2-3, and 5 on August 4-16.

Geomagnetic activity forecast for the period July 3-29, 2020 from OK1HH.

'Geomagnetic field will be, quiet on: July 3, 9-11, 14, 18-22. quiet to unsettled on: July 4, 8, 12-13, (15, 17,) 25-28. quiet to active on: (July 5-7, 16, 23-24, 29). unsettled to active on: None! active to disturbed: None!

'Solar wind will intensify on: July (4,) 5-8, (9-10, 16-18, 21-22,) 23-25, (26-27).

'Remarks: - Parenthesis means lower probability of activity enhancement. - The predictability of changes remains in the long run lower as there are very few indications.

'F. K. Janda, OK1HH.'

This video is quite dramatic and remarkable. An entire decade of continuous solar rotation images compressed into an hour:

https://youtu.be/l3QQQu7QLoM

About:

https://go.nasa.gov/2CXkw1k

Mike, KA3JAW reported from Easton, PA urging everyone to monitor 29.6 MHz FM. He heard nothing on 10 meter FM over Field Day weekend. I will start doing this myself now with a new radio that covers that band/mode.

Interesting article about solar plasma flow can be found on:

https://www.inverse.com/science/solar-cycle-plasma-flow

Thanks to AA2F for catching errors in the A index averages appearing in the ARRL Letter (my fault), so I could correct them in this bulletin.

If you would like to make a comment or have a tip for our readers, email the author at, k7ra@arrl.net.

For more information concerning radio propagation, see http://www.arrl.org/propagation and the ARRL Technical Information Service web page at, http://arrl.org/propagation-of-rf-signals. For an explanation of numbers used in this bulletin, see http://arrl.org/the-sun-the-earth-the-ionosphere.

An archive of past propagation bulletins is at http://arrl.org/w1aw-bulletins-archive-propagation. More good information and tutorials on propagation are at http://k9la.us/.

Monthly propagation charts between four USA regions and twelve overseas locations are at http://arrl.org/propagation.

Instructions for starting or ending email distribution of ARRL bulletins are at http://arrl.org/bulletins.

Sunspot numbers for June 25 through July 1, 2020 were 0, 0, 0, 0, 0, 0, and 0, with a mean of 0. 10.7 cm flux was 68.9, 67.8, 68.9, 69.2, 68.7, 68.1, and 68.9, with a mean of 68.6. Estimated planetary A indices were 3, 6, 7, 4, 3, 4, and 6, with a mean of 4.7. Middle latitude A index was 2, 6, 6, 4, 4, 5, and 6, with a mean of 4.7.

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Links of interest:

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Space Weather and Ham Radio YouTube Channel News:

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You can help!

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