Return-Path: Received: from mtain-mj03.r1000.mx.aol.com (mtain-mj03.r1000.mail.aol.com [172.21.164.87]) by air-me09.mail.aol.com (v127_r1.1) with ESMTP id MAILINME091-8bc04b9f1cf3b5; Tue, 16 Mar 2010 01:53:55 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mj03.r1000.mx.aol.com (Internet Inbound) with ESMTP id AA07138000089; Tue, 16 Mar 2010 01:53:53 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NrPhU-0001dr-0c for rs_out_1@blacksheep.org; Tue, 16 Mar 2010 05:52:20 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NrPhT-0001di-GJ for rsgb_lf_group@blacksheep.org; Tue, 16 Mar 2010 05:52:19 +0000 Received: from mx.omskcity.com ([79.133.160.2]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NrPhQ-0008MM-Jf for rsgb_lf_group@blacksheep.org; Tue, 16 Mar 2010 05:52:19 +0000 Received: from noname.nodomain.nowhere (host209.161-133-79.sotline.ru [79.133.161.209]) by mx.omskcity.com (8.13.6/8.13.6) with ESMTP id o2G5qCFm022593 for ; Tue, 16 Mar 2010 11:52:13 +0600 (OMST) (envelope-from fitec@omskcity.com) Received: from localhost (fitec@localhost) by noname.nodomain.nowhere (8.8.5/8.8.5) with SMTP id FAA00252 for ; Tue, 16 Mar 2010 05:46:41 GMT X-Authentication-Warning: noname.nodomain.nowhere: fitec owned process doing -bs Date: Tue, 16 Mar 2010 05:46:41 +0000 (GMT) From: "Alexander S. Yurkov" To: rsgb_lf_group@blacksheep.org In-Reply-To: Message-ID: MIME-Version: 1.0 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.1.8 (mx.omskcity.com [79.133.160.2]); Tue, 16 Mar 2010 11:52:14 +0600 (OMST) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Ionospheric VLF propagation Content-Type: TEXT/PLAIN; charset=US-ASCII 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: 3039400c89a64b9f1cf15b3d X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Dear Markus, your calculations are fully adequate only while ionosphere does not work. I.e. for less then about 100 km (very approximative). At 180 km and 800 km ionosphere influence is certanly worth. Generally speaking ionosphere should increase sigs. But it may be some variations because of interference of different earth-ionosphere waveguide modes which may have as same phases as opposite phases. Fore large distanses i expect behaviour E ~ 1/sqrt(d). This can be simple derived from energy conservation low. Certanly there should be someone additional exponent exp(-d/a) because of dissipation but i expect a >> 1000 km. Then exponent is neglectable for distances described. Regards, Alexander/RA9MB