Re: VLF: Tweek mode resonances

["Markus Vester" <markusvester@aol.com>]

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)

 

From: pws

Sent: Saturday, August 15, 2015 7:27 PM

To: rsgb_lf_group@blacksheep.org

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

df3lp_wf_15-08-14_grey.png
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