Return-Path: <majordom@post.thorcom.com> Received: (qmail 3533 invoked from network); 27 Oct 2001 19:26:59 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 27 Oct 2001 19:26:59 -0000 Received: (qmail 6986 invoked from network); 27 Oct 2001 19:25:36 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 27 Oct 2001 19:25:36 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 15xZ1O-0001fb-00 for rsgb_lf_group-outgoing@blacksheep.org; Sat, 27 Oct 2001 20:21:30 +0100 Received: from protactinium.btinternet.com ([194.73.73.176] helo=protactinium) by post.thorcom.com with esmtp (Exim 3.33 #2) id 15xZ1N-0001fW-00 for rsgb_lf_group@blacksheep.org; Sat, 27 Oct 2001 20:21:30 +0100 Received: from [62.7.20.53] (helo=default) by protactinium with smtp (Exim 3.22 #6) id 15xZ0j-0007aE-00 for rsgb_lf_group@blacksheep.org; Sat, 27 Oct 2001 20:20:49 +0100 Message-ID: <001b01c15f1c$854fb140$9443073e@default> From: "Alan Melia" <Alan.Melia@btinternet.com> To: "LF-Group" <rsgb_lf_group@blacksheep.org> Subject: LF: re Propagation Date: Sat, 27 Oct 2001 19:29:11 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 4.72.3110.5 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: <majordom@post.thorcom.com> Hi Ko, an interesting read but it doesnt have a lot of bearing on 136kHz. The LF signals do not penetrate the E-layer, and usually a 'wipe-out' out at HF due to a flare means enhanced daytime propagation on 136k Hz.. This was certainly the case at 1500z on Thursday. The after effects of the last CME seem to have disipated quite quickly. There was a daytime enhancement of 10-15dBs on Thursday, between 100z and 1300z . The absorption then shows a steady increase until the flare at 1500z. Friday was 'normal' with a small flare (M1.3) just after 1000z. We seem to be through the night-time absorption phase and into the rapid qsb phase. So the night-time path may not be too bad until about Tuesday night when the effects of the CME, expected tonight or early tomorrow , begins to have effect. (Forecast thanks to the invaluable data from Brian CT1DRP with a little help from the lucky rabbit's paw) If you have a clear sky (we did here an hour of so back) look out for aurora around midnight tonight (Saturday) Cheers de Alan G3NYK alan.melia@btinternet.com