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(meteorobs) Fwd Re: Radio Leonids - ELF/VLF
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Clear skies,
Lew Gramer <owner-meteorobs@atmob.org>
------- Forwarded Message
From: "Gallagher, Dennis" <Dennis.Gallagher@msfc.nasadot gov>
To: "'meteorobs@atmob.org'" <meteorobs@atmob.org>
Cc: "Phillips, Tony" <Tony.Phillips@iss.msfc.nasadot gov>
Subject: FW: Radio Leonids - ELF/VLF
Date: Mon, 26 Nov 2001 10:25:05 -0600
Tom,
I haven't come across too many scientific observations of meteor
electrophonics. You can probably find some references to such observations
in papers by Colin Keay. Here is his reference list on that subject.
http://users.hunterlinkdot net.au/~ddcsk/bibliog.htm
Beyond that http://www.triax.com/vlfradio/ this guy is a good source of
natural radio noise in ELF/VLF.
Dennis Gallagher
NASA Marshall Space Flight Center
Space Science Department
- -----Original Message-----
From: Phillips, Tony
Sent: Sunday, November 25, 2001 9:51 AM
To: Gallagher, Dennis
Subject: Radio Leonids - ELF/VLF
>Date: Sun, 25 Nov 2001 08:17:15 -0500
>From: Thomas Ashcraft <72632.1427@compuserve.com>
>Subject: (meteorobs) Radio Leonids - ELF/VLF
>To: "INTERNET:meteorobs@atmob.org" <meteorobs@atmob.org>
>
>During the Leonid peak night I listened for short periods at ELF (
>extremely low frequency ) at about 10 kHz using a McGreevy WR3-E radio. I
>was hoping to be able to correlate a visual fireball with some noticeable
>radio sound. Whereas there were abundant fireballs, including some early
>long earth grazers directly overhead, I could not tell if there was any
>specific sound generated by any one specific fireball......but.....
>
>Interestingly enough, I did hear a certain sort of sound over the course of
>listening that I had never noted before at ELF. In the midst of normal
>background "tweeks" there seemed to be many harder, sharper "cracking
>sounds". At the time I likened the sound to "brittle plastic breaking
>apart." ( Like a brittle pocket hair comb cracking in half maybe.) Some
>of these sharp "cracking sounds" were nearly ear splitting.
>
>Also, I was contacted by an observing colleague who constantly chart
>records VLF radio (24 kHz vicinity) and he reports sharp spikes on his
>chart during the Leonid peak. He has never seen sharp spikes before in his
>data like that.
>
>Is anyone aware of other ELF/VLF data, or observers, or places to go for
>further info?
>
>Tom Ashcraft
>35.29 N 105.53 W
>Lamy, New Mexico, USA
>72632.1427@compuserve.com
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