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I0OJJ > DXNEWS 13.06.26 18:09l 122 Lines 4459 Bytes #999 (0) @ WW
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Subj: ARLP024 The ARRL Solar Report
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Subject: ARLP024 The ARRL Solar Report
Date: Sat, 13 Jun 2026 10:50:11 EDT
From: ARRL <memberlist@arrl.org>
Reply-To: memberlist@arrl.org
Organization: American Radio Relay League
To: dx@ww
Newsgroups: rec.radio.amateur.dx,rec.radio.shortwave,rec.radio.info
Followup-To: rec.radio.amateur.dx,rec.radio.shortwave
SB PROP @ ARL $ARLP024
ARLP024 Propagation Forecast
ZCZC AP24
QST de W1AW
Propagation Forecast Bulletin 24 ARLP024
>From ARRL Headquarters
Newington, CT June 12, 2026
To all radio amateurs
SB PROP ARL ARLP024
ARLP024 The ARRL Solar Report
Solar activity has been at low levels this past week, with most of the
C-level activity originating from Region 4465, including the largest
flare of
the week, a C2.6 observed on June 10. There are currently 7 numbered sunspot
regions on the disk, with Region 4467 decaying to plage.
There was a Type-II radio sweep detected by the Radio Solar Telescope
Network
(RSTN) on June 10. That radio emission was associated with a coronal mass
ejection (CME) first observed at the NE quadrant by ground-based coronagraph
imagery from HAO/MLSO coronagraph late June 10, and later by space-based
coronagraph LASCO/C2. Modeling indicates there is no Earth-directed
component.
Other CME activity was observed in the coronagraph imagery later in the
period, but preliminary analysis indicated no Earth-directed component.
Solar activity is expected to remain at low levels, with a chance for
M-class
flares and a slight chance for X-class flares.
NOAAÃs SOLAR-1 satellite became operational early on June 11, becoming the
Space Weather Prediction CenterÃs primary source of solar wind data. Solar
wind speeds continued to decrease after the passage of a weak transient,
reaching 374 km/s at the end of the period. Background solar wind conditions
are expected through midday June 11, when a coronal hole high-speed stream
(CH HSS) is anticipated to become geoeffective through June 13.
Weekly Commentary on the Sun, the Magnetosphere, and the Earth's Ionosphere,
June 11, 2026, by F. K. Janda, OK1HH:
Overall solar activity is rather low and is expected to continue and decline
through mid-June. Most active regions are relatively small, typically with a
simple magnetic configuration. Nevertheless, class C flares are occasionally
observed, sometimes accompanied by CMEs.
Currently, CMEs from June 9 and 11 are expected to arrive, leading to an
increase in geomagnetic activity from June 12 to 14. A period of several
days
of calm activity is predicted to begin on June 16.
Shortwave propagation has begun to be significantly affected by the sporadic
E layer, while its increased activity can be expected to continue over the
next few days.
The Predicted Planetary A Index for June 13 to June 19 is 6, 6, 8, 8, 5, 5,
and 5 with a mean of 6.1. The Predicted Planetary K Index is 2, 2, 3, 3, 2,
2, and 2 with a mean of 2.3. 10.7 centimeter flux is 128, 120, 118, 120,
122,
122, and 125 with a mean of 122.1.
For more information concerning shortwave radio propagation, see
www.arrl.org/propagation [
http://www.arrl.org/propagation?utm_source=Informz&utm_medium=Email&utm_campaign=ARRL
] and the ARRL Technical Information Service web page at
www.arrl.org/propagation-of-rf-signals [
http://www.arrl.org/propagation-of-rf-signals?utm_source=Informz&utm_medium=Email&utm_campaign=ARRL
] . For an explanation of numbers used in this bulletin, see
www.arrl.org/the-sun-the-earth-the-ionosphere [
http://www.arrl.org/the-sun-the-earth-the-ionosphere?utm_source=Informz&utm_medium=Email&utm_campaign=ARRL
] . Information and tutorials on propagation can be found at
http://k9la.us [
http://k9la.us ] .
Also, check this: "Understanding Solar Indices" from September 2002 QST.
https://bit.ly/3Rc8Njt [ https://bit.ly/3Rc8Njt ]
NNNN /EX
ARRL The National Association for Amateur Radio(R)
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