Return-Path: Received: (qmail 22448 invoked from network); 16 Aug 1999 22:26:39 +0100 Received: from magnus.plus.net.uk (HELO magnus.force9.net) (195.166.128.27) by guiness.force9.net with SMTP; 16 Aug 1999 22:26:39 +0100 Received: (qmail 8737 invoked from network); 16 Aug 1999 16:46:19 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by magnus.plus.net.uk with SMTP; 16 Aug 1999 16:46:19 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 11GPdM-00077F-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 16 Aug 1999 17:29:16 +0100 Received: from [195.102.240.137] (helo=mserv1b.u-net.net) by post.thorcom.com with esmtp (Exim 3.02 #1) id 11GPdL-00077A-00 for rsgb_lf_group@blacksheep.org; Mon, 16 Aug 1999 17:29:15 +0100 X-Priority: 3 X-MSMail-Priority: Normal Received: from rsgb.u-net.com ([195.102.80.225] helo=rsgb.org.uk) by mserv1b.u-net.net with smtp (Exim 2.10 #61) id 11GPcJ-0005aJ-00 for rsgb_lf_group@blacksheep.org; Mon, 16 Aug 1999 17:28:11 +0100 Received: from miked.rsgbhq by rsgb.org.uk with SMTP (MDaemon.v2.7.SP5.R) for ; Mon, 16 Aug 1999 17:22:21 +0100 From: "Mike Dennison" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Organization: Radio Society of Great Britain To: rsgb_lf_group@blacksheep.org Date: Mon, 16 Aug 1999 17:25:04 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 8bit Subject: Re: LF: Solar Flare on LF... In-reply-to: <37B833BF.15126C1C@nephro.uni-kiel.de> X-Mailer: Pegasus Mail for Win32 (v3.01d) X-MDaemon-Deliver-To: rsgb_lf_group@blacksheep.org X-Return-Path: miked@mail.rsgbhq Message-ID: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org Sender: DF3LP wrote: > Recording HBG75 (75 kHz) over the whole last week I found a > strong anomaly at Saturday, 14th. I observed a steep > increase of field strength (9dB) followed by a smooth > decrease looking like a typical exponential function. > Looking to sites offering geomagnetic data I could not > explain it. So my first assumption was that it could have > been an artefact. > ==snip== > J.J.Delcourt from RMI gave the explanation: It was the > influence of a Solar Flare on LF propagation. (Thank you!) I > never observed this before... > Wow! Now if that sort of anomoly can be caught in time, it could be well worth using for a QSO - even with extremely slow speed CW. This sort of sudden peak in signal strength has been reported before, when listening to amateur signals. May be the same effect. Mike, G3XDV (IO91VT) http://www.dennison.demon.co.uk/activity.htm