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Re: LF: Polarisation, VLF Luxembourg effect

To: <[email protected]>
Subject: Re: LF: Polarisation, VLF Luxembourg effect
From: "Alan Melia" <[email protected]>
Date: Sun, 8 Nov 2015 11:05:02 -0000
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Hi Markus, I have never been able to pin it down because the reports were "anecdotal" rather than systematic, but I noted some years back that there were more reports of ICM after a magnetic storm. However I suspect that the effect, if it is related  to electron precipitation, does not occur after every geomagnetic event.
 
Maybe precipitated hot electrons need less heating from the RF source :-))
 
Peter Martinez suggested looking for it between a Loran site and a BC (or other LF) station using the GRI to dig out weak effects that may not normally always be noticed. I recruited some interested monitoring stations in the US then they shut down their Loran :-((  The path geometry needs to be right.
 
Alan
G3NYK
 
----- Original Message -----
Sent: Sunday, November 08, 2015 12:45 AM
Subject: Re: LF: Polarisation, VLF Luxembourg effect

Now also another strip involving DHO with GQD:
 138.83 - (23.4 - 22.1) = 137.53 kHz
 
73, Markus

Sent: Sunday, November 08, 2015 12:44 AM
Subject: LF: Polarisation, VLF Luxembourg effect

Something is going on up there in the ionosphere...
 
Directional colours on my LF grabber are more variable than usual, indicating that polarisation is being stirred up. And there is strong VLF-to-LF intermodulation, shown by the appearance of coloured MSK strips in the middle of the band:
 138.83 - (23.4 - 21.75) = 137.18 kHz (purple, modulated on DCF39),
 135.43 + (23.4 - 21.75) = 137.08 kHz (red, on HGA22).
 
 
Best 73,
Markus (DF6NM)
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