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Hi Peter,
thanks for this! Amazingly, the 1.68 kHz spaced
bands are visible all the way up to about 40 kHz.
All the best,
Markus (DF6NM)
Sent: Saturday, August 15, 2015 7:27 PM
Subject: Re: VLF: Tweek mode resonances
Genosse Markus,
On 18.07.2015 06:50, Markus
Vester wrote:
> ...
> a number of narrow tweek-mode resonances
at multiples of 1.72 kHz. These are obviously spherics from nearby lightnings,
bouncing multiple times vertically between the ionosphere and
ground
> ...
Found a comparable effect yesterday evening, and
only on my H-field
receivers. Unfortunately there are no data below 10 kHz
on the server.
Have to check raw data files from the
DF-rx.
H-Field:
http://lf-radio.de/cgi-bin/fh/show_wf.cgi?date=15-08-14
Chart
from Blitzortung:
http://lf-radio.org/cgi-bin/blitz/show-blitz.cgi?loc=2015&date=08-14&time=2300
Thanks
for pointing me to that phenomenon...
Peter, df3lp
Sent from my
BlitzPhone(TM) at
Bülk Lighthouse, DM3O/p, DE0135
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