Return-Path: X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,RATWARE_GECKO_BUILD autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id t7RBfs4N001977 for ; Thu, 27 Aug 2015 13:41:54 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZUvVS-00046m-2h for rs_out_1@blacksheep.org; Thu, 27 Aug 2015 12:38:10 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZUvVR-00046d-Qz for rsgb_lf_group@blacksheep.org; Thu, 27 Aug 2015 12:38:09 +0100 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1ZUvUN-00072B-Ja for rsgb_lf_group@blacksheep.org; Thu, 27 Aug 2015 12:38:08 +0100 Received: from sb.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id CC9A13273D6 for ; Thu, 27 Aug 2015 12:29:56 +0100 (BST) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 7E3AD28A1245 for ; Thu, 27 Aug 2015 11:36:43 +0000 (UTC) Message-ID: <55DEF64A.5080403@abelian.org> Date: Thu, 27 Aug 2015 11:36:42 +0000 From: Paul Nicholson User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <3EEE0BD431264721BAD95B0598D0A459@White> <55CF7668.2080508@df3lp.de> <9F755C841A0C40DEAAB4B1A3C94E7860@White> In-Reply-To: <9F755C841A0C40DEAAB4B1A3C94E7860@White> X-Scan-Signature: 086f3faad0220c9ae57a7913e711a86d Subject: Re: VLF: Tweek mode resonances Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 3988 I had to wait a while for a UK thunderstorm. I didn't get sharp resonances like those on Stefan's spectrogram, except for a short period about an hour after the storm. By that time it had moved away to the north. H-field left hand circular: http://abelian.org/vlf/tmp/150822_sferic_modes_LH_25a.png H-field right hand circular: http://abelian.org/vlf/tmp/150822_sferic_modes_RH_25a.png H-field E/W loop: http://abelian.org/vlf/tmp/150822_sferic_modes_EW_25a.png H-field N/S loop: http://abelian.org/vlf/tmp/150822_sferic_modes_NS_25a.png Vertical E-field: http://abelian.org/vlf/tmp/150822_sferic_modes_VE_25a.png On a SID monitor the resonances are visible up to 40kHz or more, and there may be a hint up to 70kHz. I need to work on that to try to bring them out. -- Paul Nicholson --