Return-Path: Received: from mtain-mc12.r1000.mx.aol.com (mtain-mc12.r1000.mx.aol.com [172.29.96.84]) by air-dc10.mail.aol.com (v127_r1.1) with ESMTP id MAILINDC104-86a84bac6fde184; Fri, 26 Mar 2010 04:27:10 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mc12.r1000.mx.aol.com (Internet Inbound) with ESMTP id 1ECF23800009A; Fri, 26 Mar 2010 04:27:09 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Nv4rb-0005F2-Bw for rs_out_1@blacksheep.org; Fri, 26 Mar 2010 08:25:55 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Nv4rb-0005Et-0R for rsgb_lf_group@blacksheep.org; Fri, 26 Mar 2010 08:25:55 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Nv4rY-0004cW-1w for rsgb_lf_group@blacksheep.org; Fri, 26 Mar 2010 08:25:54 +0000 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 0C11F3293DD for ; Fri, 26 Mar 2010 08:22:54 +0000 (GMT) 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 o2Q8Pdoj009567 for ; Fri, 26 Mar 2010 08:25:40 GMT Message-ID: <4BAC6F82.5020300@abelian.org> Date: Fri, 26 Mar 2010 08:25:38 +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> <4BABF362.8000703@toya.net.pl> In-Reply-To: <4BABF362.8000703@toya.net.pl> X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Ionospheric VLF propagation 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: 3039ac1d60544bac6fdd0d7e X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) I wrote: > James R Wait > 'A study of VLF field strength data both old and new' > Pure and applied physics, vol 41 sept 1958 pp73-85 Sorry, that should have been Pure and applied geophysics, (volume price $110, single articles a mere $34! I can get copies through the British Library but it takes weeks). Piotr wrote: > I will also try to program these formulae It's a challenge - those Legendre functions with complex parameters... there's an expression involving hypergeometric functions and some code for that in 'Numerical Recipes in C', either that or (very!) carefully transcribe/port the code in the paper's appendix. I think I will stay with the simple formula - too many other things to do! Thank you for the additional references Piotr. I miss the days when I had access to a university library, and the Internet is useless here. PS, I have a large backlog of email - apologies to those I haven't responded to yet... -- Paul Nicholson --