Return-Path: Received: from mtain-me04.r1000.mx.aol.com (mtain-me04.r1000.mx.aol.com [172.29.96.140]) by air-dd04.mail.aol.com (v129.4) with ESMTP id MAILINDD041-860a4c3577211cd; Thu, 08 Jul 2010 02:58:41 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-me04.r1000.mx.aol.com (Internet Inbound) with ESMTP id C6ADA380000C2; Thu, 8 Jul 2010 02:58:39 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OWl2e-0002V5-R5 for rs_out_1@blacksheep.org; Thu, 08 Jul 2010 07:57:04 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OWl2e-0002Uw-CT for rsgb_lf_group@blacksheep.org; Thu, 08 Jul 2010 07:57:04 +0100 Received: from thsmsgxrt12p.thalesgroup.com ([192.54.144.135]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OWl2d-0002dS-Mf for rsgb_lf_group@blacksheep.org; Thu, 08 Jul 2010 07:57:04 +0100 Received: from thsmsgirt21p.corp.thales (unknown [10.33.231.5]) by thsmsgxrt12p.thalesgroup.com (Postfix) with ESMTP id 80D3F41D1C5 for ; Thu, 8 Jul 2010 08:56:57 +0200 (CEST) Received: from thsmsgiav13p.corp.thales (10.33.231.33) by thsmsgirt21p.corp.thales (8.5.103) id 4B990ED201092F83 for rsgb_lf_group@blacksheep.org; Thu, 8 Jul 2010 08:56:57 +0200 Received: from (unknown [10.33.231.2]) by thsmsgiav13p.corp.thales with smtp id 5b1a_14eb_fff249aa_8a5d_11df_a698_0013725f4d82; Thu, 08 Jul 2010 08:56:57 +0200 Received: from nodalthc.clb.tcfr.thales (unknown [10.33.8.65]) by thsmsgirt12p.corp.thales (Postfix) with ESMTP id 6F380391BBE for ; Thu, 8 Jul 2010 08:56:57 +0200 (CEST) Received: by nodalthc.clb.tcfr.thales with Internet Mail Service (5.5.2653.19) id ; Thu, 8 Jul 2010 08:56:57 +0200 Message-ID: From: Jean-Louis.RAULT@fr.thalesgroup.com To: rsgb_lf_group@blacksheep.org Date: Thu, 8 Jul 2010 08:57:05 +0200 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,NO_REAL_NAME=0.55 Subject: LF: RE: Re: QRN Content-Type: text/plain X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.3 required=5.0 tests=NO_REAL_NAME 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: 3039ac1d608c4c35771f22fd X-AOL-IP: 193.82.116.20 > -----Original Message----- > From: owner-rsgb_lf_group@blacksheep.org > [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Alan Melia > Sent: Thursday, July 08, 2010 12:27 AM > To: rsgb_lf_group@blacksheep.org > Subject: LF: Re: QRN the morning an evening dips on the stations monitored by SID detectors are > due to increased aborption. Well, I would say that the differences of amplitude of VLF signals between day and night are due the presence or absence of the D layer and that the deep morning and evening dips are due to interferences between the ground and the sky waves. Jean-Louis F6AGR