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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).
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