Return-Path: Received: (qmail 24146 invoked from network); 11 Aug 1999 19:21:37 +0100 Received: from magnus.plus.net.uk (HELO magnus.force9.net) (195.166.128.27) by guiness.force9.net with SMTP; 11 Aug 1999 19:21:37 +0100 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit Received: (qmail 5925 invoked from network); 11 Aug 1999 18:25:15 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by magnus.plus.net.uk with SMTP; 11 Aug 1999 18:25:15 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 11Eca8-0001hf-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 11 Aug 1999 18:54:32 +0100 Received: from finch-post-10.mail.demon.net ([194.217.242.38]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 11Eca6-0001hZ-00 for rsgb_lf_group@blacksheep.org; Wed, 11 Aug 1999 18:54:30 +0100 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from dennison.demon.co.uk ([194.222.239.33]) by finch-post-10.mail.demon.net with smtp (Exim 2.12 #1) id 11Eca2-000IOJ-0A for rsgb_lf_group@blacksheep.org; Wed, 11 Aug 1999 17:54:29 +0000 Message-ID: Date: Wed, 11 Aug 1999 18:52:59 +0100 To: rsgb_lf_group@blacksheep.org From: "Mike Dennison" Subject: LF: Effects of eclipse on HBG MIME-Version: 1.0 X-Mailer: Turnpike Version 3.03a Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org Sender: 95% solar eclipse due at 1119 local (1019UTC). Viewed at work - unexpectedly cool, strange light (like looking through polaroid sunglasses) and got dim but not dark. Very few clouds. Measured HBG on 75kHz at home throughout the day using ON5OO's software. I expected a peak as the D layer absorption reduced. Actual plot showed the reverse! Slight peak (+1dB) before and after, and a double-humped drop in strength at eclipse time in UK (-5dB) and Switzerland (-4dB) [Toni, can you confirm that this was 1037UTC?]. Are there any scientists out there who can explain this. The path lay along (or slightly north of) the line of totality. The plot is on my web site. -- Mike, G3XDV http://www.dennison.demon.co.uk/activity.htm