Return-Path: Received: (qmail 20420 invoked from network); 15 Aug 1999 08:57:09 +0100 Received: from magnus.plus.net.uk (HELO magnus.force9.net) (195.166.128.27) by guiness.force9.net with SMTP; 15 Aug 1999 08:57:09 +0100 Received: (qmail 10537 invoked from network); 15 Aug 1999 02:34:26 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by magnus.plus.net.uk with SMTP; 15 Aug 1999 02:34:26 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 11FprI-0000nY-00 for rsgb_lf_group-outgoing@blacksheep.org; Sun, 15 Aug 1999 03:17:16 +0100 Received: from smtp-out2.bellatlantic.net ([199.45.39.157]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 11FprH-0000nT-00 for rsgb_lf_group@blacksheep.org; Sun, 15 Aug 1999 03:17:15 +0100 Received: from bellatlantic.net (client-151-200-125-141.bellatlantic.net [151.200.125.141]) by smtp-out2.bellatlantic.net (8.9.1/8.9.1) with ESMTP id WAA05631; Sat, 14 Aug 1999 22:21:16 -0400 (EDT) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <37B6235B.24C155AD@bellatlantic.net> Date: Sat, 14 Aug 1999 22:18:04 -0400 From: "Andre' Kesteloot" X-Mailer: Mozilla 4.02 [en]C-DIAL (WinNT; U) MIME-Version: 1.0 To: "rsgb_lf_group" Subject: LF: Ozone and LF Propagation Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org Sender: Just in case some of you have not read it yet, the Spring 1999 issue of Communications Quarterly features a thought-provoking article by Dr Robert Brown NM7M, on "Atmospheric Ozone". (pp.97-103) Quoting from his conclusion: "...there can be little doubt that atmospheric ozone plays a role in LF propagation because of its connection to processes in the lower-D region and the fact that ozone can block UV radiation from reaching that altitude range at sunrise. [...] ozone shadow has an effect, to some degree or other, every day of the week, month or year, and requires no special solar or magnetic activity." 73 Andre' N4ICK