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home | newest check | boards | help index | log | ps | userlogin | send sysop | slog | status forward | bcm news | users | version | remove cookieI0OJJ > DX 22.08.26 08:42l 139 Lines 6206 Bytes #6 (0) @ WW BID : 20012I0OJJ Read: JN1VSI GUEST Subj: ARLP034 The ARRL Solar Report Path: JH4XSY<IW0QNL<SR1BSZ<EA2RCF<CX2SA<VK7AX<GB7CIP<I0OJJ Sent: 260821/2327z @:I0OJJ.ITA.EU [Rome] $:20012I0OJJ >From i0ojj@i0ojj.ita.eu Sat Aug 22 01:27:58 2026 Received: from i0ojj.ampr.org by i0ojj.ampr.org (JNOS2.0q.1) with SMTP id AA17064375 ; Sat, 22 Aug 2026 01:27:58 +0200 Received: by i0ojj.ampr.org with NNTP id AA17064370 ; Sat, 22 Aug 2026 01:27:11 +0200 >From: "ARRL" <memberlist@arrl.org Newsgroups: rec.radio.amateur.dx,rec.radio.shortwave,rec.radio.info Followup-To: rec.radio.amateur.dx,rec.radio.shortwave Organization: American Radio Relay League Approved: RRI Admin <rec-radio-info-request@panix.com> Message-ID: <3232816036.2@informz.net> Reply-To: memberlist@arrl.org MIME-Version: 1.0 Content-Type: text/plain;charset=UTF-8 Injection-Info: reader1.panix.com; posting-host="panix6.panix.com:166.84.1.6"; logging-data="3028"; mail-complaints-to="abuse@panix.com" X-RRI-Policy: https://www.panix.com/~rram/usenet/rri/index.html X-RRI-Info-1: Send submissions to rec-radio-info@panix.com X-RRI-Info-2: Send technical complaints to rec-radio-info-request@panix.com X-RRI-Info-3: Send complaints about policy to rec-radio-info-request@panix.com X-Comment-1: The moderators do not necessarily agree or disagree with this article. 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The secondary source of C-class flares was beyond the east limb and was responsible for the largest flare of the period, a C5.0 on August 19. There were four numbered regions on the visible disk. Most of them showed some decay, losing intermediary/trailer spots or penumbra area. Region 4510 continued to rotate off the west limb. No Earth-directed coronal mass ejection (CME) was observed in the available coronagraph imagery during the period. Solar activity is expected to continue at low levels over through August 21 with a chance for M-class flares (R1-R2/minor-moderate). Solar wind parameters reflected the waning effect of the co-rotating interaction region (CIR) and dominating influence of a negative polarity coronal hole high speed stream near Earth. Solar wind speeds increased from 400 km/s to about 550-600 km/s. Phi angle remained predominantly negative during the past 24 hours. Solar wind parameters are likely to continue reflecting the presence of high speed streams associated with negative polarity coronal hole(s) through August 21. Weekly Commentary on the Sun, the Magnetosphere, and the Earth's Ionosphere, August 20, 2026, by F. K. Janda, OK1HH: Earlier this week, an active region referred to as AR 4499 during the previous solar rotation was approaching the northeastern limb of the solar disk. It emerged as AR 4513 on August 19. All four remaining active regions were located on the western side of the solar disk; therefore, had AR 4513 not emerged, there would have been a noticeable decline in overall solar activity. As it stands, however, solar activity will remain at its current level through the end of August, although it remains lower than during the previous solar rotation. Given the two larger coronal holes on the western half of the solar disk, it is no surprise that the solar wind is intensifying intermittently, contributing to slightly increased geomagnetic activity and, consequently, to intermittently deteriorating shortwave propagation conditions. However, a decline in solar activity will eventually occur, as early as the first third of September. Even before then, however, we can tentatively expect a decrease in the Earth s magnetic field activity. Given the current seasonal changes, as summer comes to an end in the ionosphere, we can expect calmer and more stable shortwave propagation conditions not only toward the end of August but also throughout most of the first half of September. The Predicted Planetary A Index for August 21 to August 27 is 12, 12, 10, 8, 5, 5, and 5 with a mean of 8.1. The Predicted Planetary K Index is 4, 4, 3, 3, 2, 2, and 2 with a mean of 2.9. Predicted 10.7 centimeter flux is 125, 125, 120, 115, 115, 110, and 110 with a mean of 117.1. 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
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