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LF: Effects of eclipse on HBG

To: [email protected]
Subject: LF: Effects of eclipse on HBG
From: "Mike Dennison" <[email protected]>
Date: Wed, 11 Aug 1999 18:52:59 +0100
Reply-to: [email protected]
Sender: <[email protected]>
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


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