Return-Path: Received: (qmail 38508 invoked from network); 4 Jan 2005 17:20:39 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore01.plus.net with SMTP; 4 Jan 2005 17:20:39 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1ClsLG-000NOt-JM for dave@picks.force9.co.uk; Tue, 04 Jan 2005 17:19:35 +0000 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1ClsLG-000NOq-Ge for dave@picks.force9.co.uk; Tue, 04 Jan 2005 17:19:34 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1ClsMI-000Lh2-Di for dave@picks.force9.co.uk; Tue, 04 Jan 2005 17:20:38 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ClsM7-0008BC-P1 for rs_out_1@blacksheep.org; Tue, 04 Jan 2005 17:20:27 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ClsM7-0008B3-DR for rsgb_lf_group@blacksheep.org; Tue, 04 Jan 2005 17:20:27 +0000 Received: from smtp806.mail.ukl.yahoo.com ([217.12.12.196]) by relay.thorcom.net with smtp (Exim 4.41) id 1ClsLv-0005OZ-63 for rsgb_lf_group@blacksheep.org; Tue, 04 Jan 2005 17:20:27 +0000 Received: from unknown (HELO Main) (Alan.Melia@213.122.32.213 with login) by smtp806.mail.ukl.yahoo.com with SMTP; 4 Jan 2005 17:20:08 -0000 Message-ID: <003e01c4f281$9f67cee0$6507a8c0@Main> From: "Alan Melia" To: rsgb_lf_group@blacksheep.org References: <8840D182F8BB7540B173D2B1FA0CA9AB034FEE7F@argos.clb.tcfr.thales> Date: Tue, 4 Jan 2005 17:16:52 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4522.1200 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4522.1200 X-SPF-Result: relay.thorcom.net: 217.12.12.196 is neither permitted nor denied by domain of btinternet.com X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=failed,none Subject: LF: Re: RE: Re: DI2AG 440KHz...rapid fading Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Spam-Filtered: by PlusNet SpamCORE (v3.00) Hi Jean-Louis, and Walter. I see a rapid almost cyclical fading on some 136kHz signals immediately after a geomagnetic storm (we have had several minor storms Kp=5 recently), the period usually lengthens on successive nights. I have suggested that this might be due to the plasma cloud "slapping" the ionosphere on one side and it then "ringing" like a wobbly jelly ( I must have eaten too much this Christmas !!) This would cause the "reflection" level to move up and down a few hundreds of metres maybe even a kilometre, which is quite sufficient to swing through a 180degree phase change. The movement required for a "null" at 440kHz is much less than at 136kHz. I would certainly be interested to see if the period of the fades increases over the course of the next few nights. Cheers de Alan G3NYK alan.melia(at)btinternet.com ----- Original Message ----- From: To: Sent: 04 January 2005 13:48 Subject: LF: RE: Re: DI2AG 440KHz > Walter et al. > > I recorded your DI2AG sigs last night from 6 PM to 6 AM . > A quick exam on the 150 ARGO snapshots during my tea time early this morning tend to show a deep QSB (period around 1 minute). > Have you got other similar remarks ? > > 73 > > Jean-Louis F6AGR > Loc. JN18DQ, near Paris