Return-Path: Received: from mtain-dh10.r1000.mx.aol.com (mtain-dh10.r1000.mx.aol.com [172.29.65.30]) by air-dd01.mail.aol.com (v128.3) with ESMTP id MAILINDD013-86574bd3f932282; Sun, 25 Apr 2010 04:11:30 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dh10.r1000.mx.aol.com (Internet Inbound) with ESMTP id 35100380000B5; Sun, 25 Apr 2010 04:11:29 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1O5wvF-0004fC-SA for rs_out_1@blacksheep.org; Sun, 25 Apr 2010 09:10:37 +0100 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1O5wvF-0004f3-F7 for rsgb_lf_group@blacksheep.org; Sun, 25 Apr 2010 09:10:37 +0100 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay2.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1O5wvD-00006e-5v for rsgb_lf_group@blacksheep.org; Sun, 25 Apr 2010 09:10:37 +0100 Received: from abelian.netcom.co.uk (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id 63344327823 for ; Sun, 25 Apr 2010 08:58:35 +0100 (BST) Received: from [127.0.0.1] (localhost [127.0.0.1]) by abelian.netcom.co.uk (8.13.1/8.13.1) with ESMTP id o3P81xO6008113 for ; Sun, 25 Apr 2010 08:02:00 GMT Message-ID: <4BD3F6F7.2080905@abelian.org> Date: Sun, 25 Apr 2010 08:01:59 +0000 From: Paul Nicholson User-Agent: Thunderbird 2.0.0.14 (X11/20080421) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4B9FD008.2070607@abelian.org> <4BAAA535.4050401@toya.net.pl> <4BAB1E85.1060304@abelian.org> <4BABA614.4030303@abelian.org> <4BD35EDA.2040408@toya.net.pl> In-Reply-To: <4BD35EDA.2040408@toya.net.pl> X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: VLF propagation (continued..) Content-Type: text/plain; charset=UTF-8; format=flowed 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=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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: 3039ac1d411e4bd3f93159b6 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Piotr wrote: > tx-rx distance: 858.7 km, R(earth): 6370 km > the height of D-layer ... three values: 60,70,80 km > 60 km 0.738 > 70 km 0.632 > 80 km 0.553 Nice work Piotr. I'd like to see a plot of signal strength against distance for 70km ionosphere and see how it compares with the simple model in http://abelian.org/vlf/9k Too bad we are stuck with their silly polynomial fit for attenuation. > In 1-2 forthcoming weekends i will try to prepare more detailed > description of the calculational scheme including some graphs, > fortran code etc. Looking forward to that. I can make good use of the fortran code. Great job! -- Paul Nicholson --