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ARRL Propagation Bulletin ARLP023 (2019)

ARLP023 Propagation de K7RA

QST de W1AW  
Propagation Forecast Bulletin 23  ARLP023
From Tad Cook, K7RA
Seattle, WA  June 7, 2019
To all radio amateurs 

ARLP023 Propagation de K7RA

According to, as of June 5 there have
been no sunspots for 17 days in a row. Average daily solar flux went
to 69.5 this reporting week (May 30 through June 5) from 67.4 in the
previous seven days. Average daily planetary A index declined from
7.3 to 5.6, while mid-latitude A index went from 8.1 to 5.

Last week I mentioned that sunspots should return soon, based on the
predicted solar flux, but those projections have softened. On June 6
the 45-day predicted solar flux was 70 on June 7-14, 72, 72 and 71
on June 15-17, 70 on June 18-29, 71 on June 30, 72 on July 1-13, 71
on July 14, and 70 on July 15-21.

Predicted planetary A index is 8, 10 and 8 on June 7-9, 5 on June
10-22, then 8, 10, 12 and 8 on June 23-26, 5 on June 27-29, 8 on
June 30 through July 2, 5 on July 3-4, 8 on July 5-6, 5 on July
7-19, then 8 and 10 on July 20-21. sent this alert on June 5: "A DAYTIME METEOR SHOWER
IS UNDERWAY: Radars in the northern hemisphere are pinging with
activity as one of the strongest meteor showers of the year takes
place in broad daylight. The source of the shower is sungrazing
Comet 96P/Machholz."

Dick Bingham, W7WKR alerted us to this, and wrote: "What a fine
6-meter opening this afternoon! I copied many of you on FT8 working
across the country. The one I really would have enjoyed capturing
was NW1P in FN67 - probably the only person in the USA there.
Listening to all the meteor-echoes was impressive. Seemed like up to
10 per MINUTE for a while."

Jon Jones, N0JK wrote:

"I enjoyed reading N8II's detailed report of his activity in the WPX
CW this year.

"Especially noted his rare Hawaiian contact on 10M in this contest
in .

"6 meters was also open from Hawaii to the mainland USA May 25.

"At almost the exact same time Jeff worked WH7V on 10, VE2XK worked
NH6Y on 6 meters:

"NH6Y  19/05/25 1859Z  50313.0 FN07 ES BL10 TU FT8 qso & grid  VE2XK
NH6Y  19/05/25 1857Z  50313.0 DN70MQ ES BL10TS   K0GU

"No Hawaii from Kansas, but logged KP4EIT and KP4AJ on 50 MHz FT8
about 2000z May 25."

Geomagnetic activity forecast for the period June 7 to July 3, 2019
from F.K. Janda, OK1HH.

"Geomagnetic field will be:
Quiet on June 13, 16-18, 28, 30, July 1, 3
Quiet to unsettled on 8, 10-11, 14, 19-22, 27, 29
Quiet to active on June (12, 15,) 26, July 2
Unsettled to active on June (7, 9,) 23-25
No active to disturbed days expected.

"Solar wind will intensify on June 10-14, 24-27

"Parenthesis means lower probability of activity enhancement."

Lance Collister, W7GJ of Frenchtown, Montana is interested in 6
meter moonbounce, and runs a Magic Band EME email group, which you
can subscribe to via his web site:

Dr. Tamitha Skov's latest video can be found at:

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

Instructions for starting or ending email distribution of ARRL
bulletins are at

Sunspot numbers for May 30 through June 5, 2019 were 0, 0, 0, 0, 0,
0, and 0, with a mean of 0. 10.7 cm flux was 68.7, 68.7, 69.7, 69.9,
69.8, 70, and 69.8, with a mean of 69.5. Estimated planetary A
indices were 8, 5, 4, 4, 5, 8, and 5, with a mean of 5.6. Middle
latitude A index was 8, 5, 3, 4, 4, 7, and 4, with a mean of 5.


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