Return-Path: <owner-rsgb_lf_group@blacksheep.org> Received: from mtain-dg08.r1000.mx.aol.com (mtain-dg08.r1000.mx.aol.com [172.29.65.16]) by air-me04.mail.aol.com (v129.4) with ESMTP id MAILINME042-8bad4cd1bfd0151; Wed, 03 Nov 2010 16:02:24 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dg08.r1000.mx.aol.com (Internet Inbound) with ESMTP id 0065738000510; Wed, 3 Nov 2010 16:02:22 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PDjW1-0003k0-KM for rs_out_1@blacksheep.org; Wed, 03 Nov 2010 20:01:01 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PDjW1-0003jr-8q for rsgb_lf_group@blacksheep.org; Wed, 03 Nov 2010 20:01:01 +0000 Received: from relay03.pair.com ([209.68.5.17]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from <w1tag@charter.net>) id 1PDjVy-0001WD-HF for rsgb_lf_group@blacksheep.org; Wed, 03 Nov 2010 20:01:01 +0000 Received: (qmail 4868 invoked from network); 3 Nov 2010 20:00:55 -0000 Received: from 64.206.3.50 (HELO ?192.168.1.56?) (64.206.3.50) by relay03.pair.com with SMTP; 3 Nov 2010 20:00:55 -0000 X-pair-Authenticated: 64.206.3.50 Message-ID: <4CD1C0EE.4010209@charter.net> Date: Wed, 03 Nov 2010 16:07:10 -0400 From: John Andrews <w1tag@charter.net> User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.9) Gecko/20100915 Thunderbird/3.1.4 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4CD1BD56.4030803@iup.uni-heidelberg.de> In-Reply-To: <4CD1BD56.4030803@iup.uni-heidelberg.de> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: VLF: strange propagation effects on VLF Content-Type: text/plain; charset=ISO-8859-1; format=flowed X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: 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-aol-global-disposition: G x-aol-sid: 3039ac1d41104cd1bfce536a X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Content-Transfer-Encoding: quoted-printable X-Mailer: Unknown (No Version) Stefan, There was a C4-level solar flare at 1220 UTC from an active region=20 behind the Sun's limb. Others noted the event at VLF. See: http://www.spaceweather.com/ John, W1TAG On 11/3/2010 3:51 PM, Stefan Sch=E4fer wrote: > VLF, > > There are strange propagation effects going on on VLF in the last days. > I just observed that there was a significant _sudden_ rise/enhancement > of all the signal levels arround 12:15 UTC. This effect is observed on= 3 > spectrograms, DF6NM's 4X1RF's(some minutes later) and DK7FC's grabber so > it cannot be an accident. See the pictures. > How can this be possible? It seems the autumn and winther period > provides some interesting effects there which are not completely > understood, at least by me ;-) > > 73, Stefan/DK7FC >