ARRL

Secure Site Login

ARRL Propagation Bulletin ARLP028 (2019)

SB PROP @ ARL $ARLP028
ARLP028 Propagation de K7RA

ZCZC AP28
QST de W1AW  
Propagation Forecast Bulletin 28  ARLP028
From Tad Cook, K7RA
Seattle, WA  July 12, 2019
To all radio amateurs 

SB PROP ARL ARLP028
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:

https://bit.ly/2G7Oz5g

A recent video from Tamitha Skov:

https://youtu.be/q066gUaSsAU

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
https://sdr.hu/?q=kiwisdr .  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, k7ra@arrl.net.

For more information concerning radio propagation, see the ARRL
Technical Information Service 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 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.
NNNN
/EX