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Главная » 2019 » Июнь » 29 » Propagation Forecast Bulletin 26 ARLP026 From Tad Cook, K7RA
15:36
Propagation Forecast Bulletin 26 ARLP026 From Tad Cook, K7RA
SB PROP @ ARL $ARLP026
ARLP026 Propagation de K7RA


ZCZC AP26
QST de W1AW 
Propagation Forecast Bulletin 26 ARLP026
From Tad Cook, K7RA
Seattle, WA June 28, 2019
To all radio amateurs 

SB PROP ARL ARLP026
ARLP026 Propagation de K7RA

A new sunspot group emerged on June 24, but don't count on it
persisting much longer. It emerged already far along the western
limb, and is about to rotate off the visible solar disc. Sunspot
numbers on June 24-27 were 24, 12, 11 and 11.

Average daily sunspot number increased from 0 to 6.7 over the week
of June 20-26, while average daily solar flux increased from 67.1 to
67.4.

Average daily planetary A index decreased from 5.3 to 5, and average
daily middle latitude A index decreased from 7 to 5.7.

Predicted solar flux is 67 on June 28 through July 5, 68 on July 6,
69 on July 7-9, 68 on July 10-11, 67 on July 12-27, 68 on July 28,
69 on July 29-31, 68 on August 1-2, 69 on August 3-5, 68 on August
6-7, and 67 on August 8-11.

Predicted planetary A index is 5 on June 28-30, 8 on July 1, 5 on
July 2-5, 8 on July 6, 5 on July 7-9, 8 on July 10-11, 5 on July
12-20, then 8, 12 and 10 on July 21-23, 5 on July 24 through August
1, 8 on August 2, 5 on August 3-5, 8 on August 6-7, and 5 on August
8-11.

You can see daily updates of these predictions, usually sometime
after 2100 UTC at, ftp://ftp.swpc.noaa.gov/pub/forecasts/45DF/ .

Geomagnetic activity forecast for June 28 until July 24, 2019 from
F.K. Janda, OK1HH, who has been compiling this weekly geomagnetic
forecast since January 1978.

"Geomagnetic field will be:

"Quiet on June 28, 30, July 9, 14-16, 21
Quiet to unsettled on June 29, July 3, 8, 10-11, 13, 17, 20
Quiet to active on June July 1 (- 2), 4-6, 12, 18, 24
Unsettled to active on July 7, 19, 22-23
No disturbed conditions predicted.

"Solar wind will intensify on June (28,) July 5-7, (8-9,) 10-11,
(17-19, 22-24)

"Parenthesis means lower probability of activity enhancement."

On Tuesday, June 25, NN4X reported from Florida:

"Amazing over-the-pole conditions on 17M this morning (6/25/2019).

"Decoded dozens of JAs on FT8 between 1200Z and 1245Z and worked a
few. UA0BA (NP49) was logged at 1512Z, worked HS0ZIV at 1519Z, and
was called by BH4QYX immediately afterwards, but did not complete
that QSO."

The latest video from Dr. Tamitha Skov, WX6SWW:

https://youtu.be/XzX1Ea7pqz4

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 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 20 through 26, 2019 were 0, 0, 0, 0, 24,
12, and 11, with a mean of 6.7. 10.7 cm flux was 67.7, 66.5, 66.4,
67.2, 67.9, 67.9, and 68, with a mean of 67.4. Estimated planetary A
indices were 7, 6, 4, 3, 5, 4, and 6, with a mean of 5. Middle
latitude A index was 8, 8, 5, 4, 5, 5, and 5, with a mean of 5.7.
NNNN
/EX
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