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VLF: Selective fading on moving storm spherics

To: <[email protected]>, <[email protected]>
Subject: VLF: Selective fading on moving storm spherics
From: "Markus Vester" <[email protected]>
Date: Fri, 23 May 2014 10:58:27 +0200
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Last night a pronounced fading pattern occured on my VLF dual-loop grabber. It was apparently caused by an area of fairly localized lightning activity, which passed over Nuernberg around 20 UT, and continued moving northward during the night. shows a colour-DF spectrogram, including an insert from the archive covering Germany from 22 to 04 UT. While the storm activity receded from about 200 to 500 km distance, the spectral maxima moved upwards, and their spacing increased from about 2 to 3 kHz. This would be consistent with superposition of groundwave and variable elevation angle skywave: When the source moves away, skywave becomes less steep, associated with a smaller geometrical delay difference and further spaced spectral features.
All the best,
Markus (DF6NM)
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