Fascinating -  just had to go and look-up Schumann resonances in Wikipedia.
The article there says that the waveguide has a harmonic response at
59.4Hz, and gets excited by the US power grid.  In which case I would
have thought it ought to be visible, but there is nothing on the
trace.

Also, what looks like data at 80Hz - could that be a ULF submarine
transmission? Those have been observed, and there used to be a website
somwhere that showed  slow FSK in the ULF region, believed to be from
a Russian transmitter.

Andy  G4JNT



On 08/11/2007, Wolfgang Büscher <[email protected]> wrote:
> Greetings all,
>
> Not LF or MF, but this may be interesting for some group members:
> Renato (IK1QFK) has set up a new automated ULF / ELF monitoring station :
>
> http://www.vlf.it/livedata.html
>
> It measures seismic (mechanical) events, the E-field, and the H-field
> (the latter with radio direction finding).
> It's amazing how clear the first few Schumann resonances can be seen in
> the E-field spectrogram.
>
> Cheers,
>  Wolf DL4YHF .
>
>
>