Return-Path: Received: (qmail 17782 invoked from network); 30 Oct 2003 14:46:37 -0000 Received: from unknown (HELO netmail00.services.quay.plus.net) (212.159.14.218) by mailstore with SMTP; 30 Oct 2003 14:46:37 -0000 Received: (qmail 24004 invoked from network); 30 Oct 2003 14:46:36 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Spam-detection-level: 11 Received: from post.thorcom.com (193.82.116.20) by netmail00.services.quay.plus.net with SMTP; 30 Oct 2003 14:46:23 -0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1AFE2Z-0005iz-Ok for rsgb_lf_group-outgoing@blacksheep.org; Thu, 30 Oct 2003 14:44:47 +0000 Received: from [147.197.200.9] (helo=hestia.herts.ac.uk) by post.thorcom.com with esmtp (Exim 4.14) id 1AFE2S-0005iD-Gi for rsgb_lf_group@blacksheep.org; Thu, 30 Oct 2003 14:44:40 +0000 X-Fake-Domain: gemini Received: from gemini ([147.197.200.44] helo=gemini.herts.ac.uk) by hestia.herts.ac.uk with esmtp (Exim 3.22 #1) id 1AFDzJ-0001gB-00 for rsgb_lf_group@blacksheep.org; Thu, 30 Oct 2003 14:41:25 +0000 X-No-DNS-For: 147.197.232.252 Received: from [147.197.232.252] (helo=rsch15) by gemini.herts.ac.uk with esmtp (Exim 3.33 #1) id 1AFDzI-0004W6-00 for rsgb_lf_group@blacksheep.org; Thu, 30 Oct 2003 14:41:25 +0000 From: "James Moritz" To: rsgb_lf_group@blacksheep.org Date: Thu, 30 Oct 2003 14:41:24 -0000 Organization: University of Hertfordshire X-Bad-Message-ID: no DNS (rsch15) Message-ID: <000001c39ef3$e55106c0$fce8c593@rsch15> MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.2627 Importance: Normal In-reply-to: <5.1.0.14.0.20031030093018.029f4b20@POP3.freeler.nl> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-UH-MailScanner: No Virus detected Subject: RE: LF: Solar Activity Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on post.thorcom.com X-Spam-Status: No, hits=0.2 required=5.0 tests=HTML_60_70,HTML_FONTCOLOR_UNKNOWN,HTML_MESSAGE autolearn=no version=2.60 X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rsgb_lf_group-outgoing@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Spam-Rating: 2 Content-transfer-encoding: 8bit

PA0SE wrote:

Yesterday at 2030 UTC I had a QSO on 80 metres with PA0HRT (over 190km) and PA0HRP (over 54km), the latter on his motorboat.
After some 15 minutes the signals suddenly almost disappeared; we had just time to agree to QSY to 160 m….

Dear Dick, LF Group,

There was a further X10 flare at almost exactly that time – but it seems surprising to me that a flare could have such an immediate effect after sunset – although perhaps the F layer would still be in sunlight at 2045utc?

I have not looked at my overnight 137kHz screen captures yet, but listening briefly last night, there seemed to be remarkably little QRN on the band apart from some occasional loud crashes which I took to be local thunder activity. There were also fewer and weaker spectral lines around the 137.77kHz region compared to usual.

Cheers, Jim Moritz

73 de M0BMU