Hi,
I think you were addressing Thomas, first the Fostex, I own this recor=
der and dont recall any file split modes. You can set the max file size to =
be 2 or 4 GB and thats as good as it gets...
Ill also chime in with some work I did a while ago with sensitive fluxgate =
magnetometers
which is (somewhat) related to the magnetic chorus, although I dont recall =
observing any major differences between dawn and dusk, besides less interfe=
rence due to passing vehicles etc.
Earth Music: The pulsing I believe to be an artifact from the recorder with=
the tones drifting around due to the flux changes.
http://www.urlme.net/blog/?p=3D638
The USGS National Geomagnetism program has magnetometers which can be viewe=
d in realtime:
http://geomag.usgs.gov/observatories/data/realtime/
The earths field also makes some interesting images: http://www.urlme.net/b=
log/?p=3D622
BR,
Mike.
> I take your position that this is nature recording. In fact, if I remembe=
r correctly from my limited research, there is a dawn and dusk chorus in el=
ectromagnetism produced by the Earth's magnetosphere.. is this correct?
>
> I also wonder about how man-made transmissions are affecting this chorus =
since we have sliced up the usable spectrum (even VLF?) for our own uses.
>
> As for the biological connection I am very skeptical. Outer space is an e=
xtraordinarily hostile environment for life - even for the most hardy of ex=
ample organisms from Earth. Ultraviolet light on Earth alone is enough to d=
estroy DNA in most (but not all!) bacteria. Add to that the pressure and he=
at of an atmospheric entry and whatever organism that might have survived s=
pace must now weather a literal firestorm... not impossible, just a little =
improbable... Like I said though, I'm skeptical and need more information. =
But maybe this is a topic for another time/place :)
>
> Cheers
> David
>
> --- In Thomas Ashcraft <ashcraft@> wrot=
e:
> >
> > (I am writing partly in response to the Fostex file limitation thread.)
> >
> > I have been doing nightly ten hour long duration outdoor recording sinc=
e
> > last February 2009 with an Edirol R09HR powered by a Tekeon power pack=
> > and recording to a Panasonic 16 GB SDHC memory card. It has worked
> > without a glitch.
> >
> > :
> >
> > My recording project has been to attempt capture direct VLF/ELF radio
> > emissions from meteors in conjunction with my all-sky video camera
> > system. I have about 100 visual captures and have about ten meteors tha=
t
> > exhibit possible direct electromagnetic emissions but I consider them
> > inconclusive thus far. Here is a sample data/video/sound page from last=
> > night:
> > http://www.heliotown.com/Fireball_June_07_2009.html
> >
> > Some people would put these studies in the realm of physics or radio
> > astronomy but I also personally consider it "nature recording". Aside
> > from physical meteoric infall I think there might also be a possible
> > biological and/or microbial aspect in the space dust, as yet to be
> > discovered.
> >
> > Hence, I fire up my trusty Edirol each evening for the long duration
> > vigil. :-)
> >
> > Thomas Ashcraft
> > New Mexico
> >
>
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