Return-Path: Received: from mtain-dj10.r1000.mx.aol.com (mtain-dj10.r1000.mail.aol.com [172.19.187.146]) by air-mc02.mail.aol.com (v129.4) with ESMTP id MAILINMC023-a8d54c35b2e91ec; Thu, 08 Jul 2010 07:13:45 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dj10.r1000.mx.aol.com (Internet Inbound) with ESMTP id CEC89380000DB; Thu, 8 Jul 2010 07:13:43 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OWp2J-0003Ub-Dt for rs_out_1@blacksheep.org; Thu, 08 Jul 2010 12:12:59 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OWp2J-0003US-20 for rsgb_lf_group@blacksheep.org; Thu, 08 Jul 2010 12:12:59 +0100 Received: from moutng.kundenserver.de ([212.227.126.187]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OWp2I-0004gJ-7i for rsgb_lf_group@blacksheep.org; Thu, 08 Jul 2010 12:12:59 +0100 Received: from [192.168.1.64] (188-221-89-85.zone12.bethere.co.uk [188.221.89.85]) by mrelayeu.kundenserver.de (node=mreu2) with ESMTP (Nemesis) id 0LznVv-1PAZZQ21St-014OSx; Thu, 08 Jul 2010 13:12:51 +0200 From: "Dave Sergeant" To: rsgb_lf_group@blacksheep.org Date: Thu, 08 Jul 2010 12:12:49 +0100 MIME-Version: 1.0 Message-ID: <4C35B2B1.29543.13B3D7A@dave.davesergeant.com> In-reply-to: <002301cb1e8c$d28d4740$4001a8c0@lark> References: , <002301cb1e8c$d28d4740$4001a8c0@lark> X-mailer: Pegasus Mail for Windows (4.52) Content-description: Mail message body X-Provags-ID: V02:K0:M5l64IxNwFC3LVJqDyCPZ2i6D69AKvwL9iRTRujXMrb dvtx7P7d+9szdE5e3gTONRwKWo1WCnVR9dWJJF5B/Keh4sKWdL HWpeD/cunewf55J+Qy+JZ7K/gPM4sUNEC1wH7WVTukAyoP6bQk 3t9rgLs3JvHoBN0iKy9hFzclNWSz5+BA2UIizuhUM/3fyQ2A+t 6ZOh9A5R3pryDu5o8iiqFQjCpj3aKYszWNKG+KMwPU= X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: QRN Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT 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: 3039cdbc9d0f4c35b2e76a20 X-AOL-IP: 193.82.116.20 X-AOL-SPF: domain : blacksheep.org SPF : none On 8 Jul 2010 at 12:00, Alan Melia wrote: > See a QST article by the late Bob Brown NM6M around 2000 (I can't find > the reference) which describes the illumination at the dawn edge of the > ionosphere from underneath which creates an intensely absorbing > condition. As the intensity increases with solar elevation and the > illumination is from above the attenuation actually decrease You mean: Bubbles in the Ozone Layer - Bob Brown NM7M (not NM6M) QST December 1999 p44-46 Have just downloaded it from the ARRL Members Only Archive http://p1k.arrl.org/pubs_archive/97434 73 Dave G3YMC http://www.davesergeant.com