XPost: rec.radio.shortwave, rec.radio.info

SB PROP @ ARL $ARLP026
ARLP026 Propagation de K7RA

ZCZC AP26
QST de W1AW
Propagation Forecast Bulletin 26 ARLP026

From Tad Cook, K7RA

Seattle, WA July 1, 2022
To all radio amateurs

SB PROP ARL ARLP026
ARLP026 Propagation de K7RA

Solar activity took a dramatic plunge over the recent reporting week
(June 23 to 29) but geomagnetic activity stayed exactly the same.
Field Day weekend saw rising geomagnetic numbers, with planetary A
index at 8, 16 and 23, Friday through Sunday.

On Sunday the geomagnetic activity was a problem, although not
severe, with many stations in Field Day reporting increased
absorption. The planetary K index peaked at 5 (a big number) at the
end of the UTC day on Saturday and continued into the early hours of
Sunday, which was early Saturday evening here on the West Coast.

This happened because of a crack in Earth's magnetosphere, detailed
here:

https://bit.ly/3ONZdQ9

Compared to the previous seven days, average daily sunspot numbers
declined from 124.6 to 49.1, while average daily solar flux dropped
from 140.5 to 105.3.

Planetary and middle latitude A-index averages were both the same as
the previous week, all numbers around 11.

The prediction from the USAF 557th Weather Wing is not very
optimistic, with solar flux peaking at 140 on July 11 to 16.

The prediction shows 10.7 cm solar flux at 90 on July 1, 95 on July
2, 105 on July 3 to 5, then 110, 120, 130 and 135 on July 7 to 10,
140 on July 11 to 16, then 135, 130, 125 and 120 on July 17 to 20,
and 115, 110, 105 and 100 on July 21 to 24, 95 on July 25 and 26,
100 on July 27 to 29, then 105, 110, 115, 120 and 125 on July 30
through August 3, then 130 on August 4 and 5, and back to 140 again
on August 7 to 12.

Predicted planetary A-index is 5 on July 1 to 7, then 8, 8, 12 and 8
on July 8 to 11, 5 on July 12 and 13, 12 on July 14 to 16, 10 on
July 17, 8 on July 18 to 21, then 12, 15, 15 and 10 on July 22 to
25, and 5 on July 26 through August 4, then 8, 12 and 8 on August 5
to 7.

F. K. Janda, OK1HH writes, "Solar activity has declined over the
last seven days. Geomagnetic activity was highest on June 26
(G1-class geomagnetic storm broke out around midnight UT on June 25
and 26) and was lower on June 28 and 29. On June 26, a big, bright
CME billowed away from the sun's southern hemisphere. A slow-moving
CME that left the sun could pass close to Earth on June 30. The
near miss, if it occurs, could disturb our planet's magnetic field.

A dark filament of magnetism erupted in the sun's northern
hemisphere on June 28, but no CME was observed after the explosion.
Shortwave propagation conditions were relatively worse on June 26
and 27. After that, they began to improve, but only very slowly due
to the declining solar activity."

A new space weather report and forecast from Dr. Tamitha Skov,
WX6SWW, our Space Weather Woman.

https://youtu.be/0yAS_FpLTsk

Tomas Bayer of the Department of Geomagnetism, RWC Prague, at the
Budkov Observatory wrote this geomagnetic activity summary:

"After the last active events on June 24 to 26, which without a
storm event did not exceed the active level (local K-index = 4), we
expect a geomagnetic activity decrease to quiet to unsettled level
during the coming seven days.

More unsettled geomagnetic activity can be expected about July 3 and
4, and also at the end of the currently forecast period on July 7.
Then we expect geomagnetic activity at a quiet to unsettled level."

Here are pictures of the Budkov Observatory:

https://bit.ly/3ugnUfv

https://bit.ly/3bH9Pl4

How big is our nearest star?

https://bit.ly/3yb6cv6

Cycle forecasts, wrong or right?

https://bit.ly/3R3HQfF

Storm watch, from the popular press:

https://bit.ly/3bGvXfs

Reader David Moore, a frequent contributor, sent this:

https://bit.ly/3Agoo9g

It hasn't been updated recently, but here is a blog devoted to
propagation:

http://ka5dwipropagation.blogspot.com

Send your tips, questions or comments to k7ra@arrl.net.

For more information concerning shortwave radio propagation, see http://www.arrl.org/propagation and 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/ .

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

Sunspot numbers for June 23 through 29, 2022 were 69, 60, 31, 33,
32, 71, and 48, with a mean of 49.1. 10.7 cm flux was 121.4, 115.4,
108.1, 102, 98.2, 96.1, and 96.2, with a mean of 105.3. Estimated
planetary A indices were 10, 8, 16, 23, 12, 8, and 6, with a mean of
11.9. Middle latitude A index was 12, 8, 14, 15, 15, 11, and 7, with
a mean of 11.7.
NNNN
/EX

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XPost: rec.radio.shortwave, rec.radio.info

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 30, 2023
To all radio amateurs

SB PROP ARL ARLP026
ARLP026 Propagation de K7RA

Space Weather News sent this alert on June 29:

"BIG SUNSPOT ALERT: One of the biggest sunspots in years is directly
facing Earth. AR3354 is 10 times wider than Earth and about 1/3rd
the size of the historical Carrington sunspot. It's so big,
observers in Europe and North America are seeing it naked eye
through the smoke of Canadian wildfires. Earth-directed flares are
likely in the days ahead."

See https://spaceweather.com/ for continuing coverage.

Conditions were favorable over the Field Day weekend, with the
exception of a brief period when the planetary K index rose to 5 on
Saturday night. This is mentioned in the commentary by OK1HH which
follows.

There were five new sunspot groups on June 23, two more on June 24,
another on June 26 and another on June 27.

Average daily sunspot numbers were up, and solar flux was down.

Average daily sunspot number rose from 143 to 170, and average daily
solar flux declined slightly from 165.4 to 160.3.

This is unexpected, because we normally see these values track
together.

Predicted solar flux is 150 on June 30 through July 5, 155 on July
6, 135 on July 7-8, then 145, 155, 160, 165 and 170 on July 9-13,
175 on July 14-18, 170 on July 19-21, then 160, 150, 145, 145, 140
and 135 on July 22-27, then 130 on July 28 through August 1, 135 on
August 2-4, then 145, 155, and 165 on August 5-7. Flux values may
continue to rise to a peak of 175 before mid-August.

Predicted planetary A index is 8, 15 and 10 on June 30 through July
2, 5 on July 3-7, 12 and 8 on July 8-9, 5 on July 10-11, then a
stormy 20 and 30 on July 12-13, 8 on July 14-23, 12 on July 24-25, 8
on July 26-27, 12 on July 28-29, 8 on July 30, 5 on July 31 through
August 3, 12 and 8 on August 4-5, 5 on August 6-7, then 20 and 30
again on August 8-9. Note that recurring stormy conditions are
predicted at one solar rotation, which is about 27.5 days, following
the July 12-13 prediction.

The above predictions are from forecasters Thompson and Kiser at the
USAF space weather group.

Weekly Commentary on the Sun, the Magnetosphere, and the Earth's
Ionosphere June 30 to July 06, 2023 from F.K. Janda OK1HH.

"In the solar X-ray field during June we could observe the most
significant solar flare so far: X1 in the active region AR3341. It
happened on June 20 at 1709 UTC near the southeastern limb of the
solar disk. In the region where the Sun was high, it caused the
Dellinger Effect, https://bit.ly/3NA61kT .

"The same sunspot group was also the source of the M4.8 flare two
days later. It ejected a CME, but not toward Earth.

"Nevertheless, its passage close to Earth probably caused an
increase in geomagnetic activity on the evening of 24 June.
Theoretically, it could also have been a CME from the X1 eruption of
20 June.

"On June 26, we were surprised by sunspot group AR3354 just above
the solar equator and east of the central meridian. It did not exist
the day prior. Over the next two days its area grew to ten times the
size of the Earth, making it easily observable by the naked eye.

"Significantly, its magnetic configuration changed to
beta-gamma-delta, which is enough energy for powerful solar flares.

"The geomagnetic field has been quiet to unsettled so far.

"AR3354 will be pointed directly toward Earth in the next few days,
so it looks like the next disturbance could begin on July 1. And of
course, a possible large flare could cause a Dellinger Effect
throughout the whole HF spectrum."

Pat, W5THT wrote:

"I have been an active ham since 1956 and on the Mississippi coast
since 1971. This year has strengthened my belief in an old
observation.

"There is/was a dome of high pressure that moved from over Texas to
now over me. Before it moved east, I was able to take part in the 6
meter propagation to Europe.

"Since it moved over me, the DX Maps page shows a gap in the DX
propagation from northern Florida to central Louisiana. This is not
the first time I have seen it happen, but the new generation of TV
weather persons presented a picture of the dome of high pressure
that coincided with my propagation observations. Suspicions
confirmed?

"Years ago, on 2 meters I noticed that propagation followed weather
fronts up the east coast. Thanks for reading this and perhaps
someone younger than me has already done the research."

Jon Jones, N0JK wrote:

"Wow -- a surprise opening on 6 meter FT8 to Brazil June 25!

"A CME impact at 1900 UTC may have boosted the TEP MUF Sunday
afternoon. That and some help with sporadic-E -- opening to Brazil
on 6 meters from North America during the summer.

"Had been out with our dog. Saw WQ0P PSK flags for PY2XB. Turned on
radio at home with dipole. PY2XB was loud. Really loud. Also copied
PY5CC. He spotted me as well, but no QSO. PY2XB in for almost half
an hour. Like a pipeline. Saw him work a few 5s and 0s. KC0CF worked
CE2SV. With higher solar activity, the TEP zone still works even in
our summer. This mode works for D2UY (Angola), 3B9FR (Rodrigues
Island in Indian Ocean), and ZL."

An article on Solar Cycle 25 peak and nice images:

https://bit.ly/3ps6iOI

Understanding Space Weather: A Glossary of Terms:

https://bit.ly/3XuimeQ

"Astro Bob" on that big sunspot:

https://bit.ly/46rC3YU

Frequent contributor David Moore shared this fascinating article
comparing the current big sunspot with the one that launched the
infamous Carrington Event 164 years ago.

https://bit.ly/3CUGZYC

Another Solar Cycle article:

https://bit.ly/3XvIk1y

Yet another Carrington Event article:

https://bit.ly/3XuSe3o

Article about Solar max:

https://bit.ly/44jM5tP

A Houston Chronicle article on solar max:

https://bit.ly/445vtWf

Flares and how they are measured:

https://bit.ly/3prvtRs

A video from Dr. Tamitha Skov, WX6SWW, from last week:

https://www.youtube.com/watch?v=sfXz9nk6NDs

Send your tips, reports, observations, questions and comments to
k7ra@arrl.net. When reporting observations, don't forget to tell us
which mode you were operating.

For more information concerning shortwave radio propagation, see http://www.arrl.org/propagation and 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 .

Also, check this article from September, 2002 QST:

https://www.arrl.org/files/file/Technology/tis/info/pdf/0209038.pdf

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/

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

Sunspot numbers for June 22 through 28, 2023 were 176, 194, 200,
180, 158, 141, and 141, with a mean of 170. 10.7 cm flux was 173.2,
169.7, 160.8, 154.8, 157.7, 151.2, and 154.9, with a mean of 160.3.
Estimated planetary A indices were 8, 9, 16, 15, 11, 8, and 8, with
a mean of 10.7. Middle latitude A index was 8, 9, 16, 10, 11, 7, and
8, with a mean of 9.9.
NNNN
/EX

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