Thomas,
You have a very interesting twist on nature recording, thank you for
sharing with us. Natural sound is more than just biophony. As we
listen, we sometimes are able to contribute to the world's knowledge
with citizen science. Looks like you've done so here.
Kevin J Colver
Soundscapes for Birders - a Podcast of Natural Sounds
www.7Loons.com
On Nov 2, 2010, at 7:12 AM, Thomas Ashcraft wrote:
> Hi.
> .
> Some of my nature recording extends into the realm of lightning and
> transient luminous events ( sprites) but audio-wise it is mostly radio
> oriented and non-microphonal.
>
> This past year I did a lot of work with sprites, elves and halos which
> are very ephemeral and hard to capture. The existence of sprites has
> only been proven since 1989. Info on sprites from wikipedia here:
> http://en.wikipedia.org/wiki/Sprite_%28lightning%29
>
> Maybe some of you folks have gotten millisecond glimmers of visual
> sprites above far distant thunderstorm cells?
>
> I did some of the work at ELF/VLF (extremely low frequency) in
> conjunction with my all-sky video camera. At ELF/VLF sprites produce
> "clicks" and intricate electrical "splattering" from their discharges.
>
> But, (eureka!), I have made a discovery. I discovered that sprites
> will
> reflect analog very high frequency transmitters off of their
> ionization
> and plasma columns as they extend 90 kms into the sky. The reflections
> are unambiguous.
>
> My best VHF sprite recording specimen:
> http://www.heliotown.com/SPvhfAug032010_044340ut_Ashcraft.mp4
>
> Page of sprite captures:
> http://www.heliotown.com/Sprites_and_Radio_Emissions.html
>
> ELF/VLF sprites:
> http://www.heliotown.com/Transient_Luminous_Events.html ( movie at
> bottom of page)
> http://www.heliotown.com/SpJune162010_090011mag_Ashcraft.mp4
> :
>
> Mini lightning ( non-sprite) movies and sound at VLF/ELF with a
> McGreevy
> WR3-E:
> http://www.heliotown.com/Lightning_Ashcraft.html
> :
>
> Thomas | New Mexico
>
> Thomas Ashcraft
> www.heliotown.com
>
>
>
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