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Re: (meteorobs) =?iso-8859-1?Q?=EF=D4=D7=C5=D4?=: (meteorobs) Electrophonic meteors
I listened to the video clip, but heard something more like a somewhat slow and low volume crackling
sound than a deep 'pop'. Note that an E appears on the screen to denote the start of the sound, and
that use of the right mouse button allows one to repeat the clip. I printed the article, which I
will read later.
As an aside, my understanding is that a bolide is a meteor that can be heard (as an acoustic wave)
but I just read somewhere on the web, I believe a NASA site, that it was a bolide that killed the
dinosaurs. In fact, the author repeated bolide several times. My impression is that people sometimes
use the term to mean a very large and bright meteor; however, one of the size that killed off the
dinosaurs, I am sure, could probably have easily been heard.
Andrei Ol'khovatov wrote:
> Dear Svaven and All,
>
> I am glad to hear that you confirmed what I wrote for more than a decade
> (see www.geocities.com/olkhov/electro1.htm and ref. in it), i.e. that the
> theory of "magnetic spagetti" relaxation in a wake of a meteor could not
> explain electrophonic sounds.
> I also glad that you came to similar idea which I published a decade ago,
> i.e. that a meteor is probably just a trigger of electrophonic sounds in
> some specific geophysical conditions.
> I hope that in your next articles you will come even closer to my idea, and
> maybe mention this in them...
>
> Best wishes,
> Andrei Ol'khovatov
> Russia Moscow
>
> -----Исходное сообщение-----
> От: Slaven Garaj <slaven.garaj@epfl.ch>
> Кому: meteorobs@atmob.org <meteorobs@atmob.org>
> Дата: 23 января 2002 г. 16:05
> Тема: (meteorobs) Electrophonic meteors
>
> >Dear fellow meteor observers
> >
> >I would like to draw your attention to a recent article from our group,
> >entitled: "Instrumental recording of electrophonic sounds from Leonid
> >fireballs", by G. Zgrablic et al. The article considers the phenomenon
> >of the electrophonic meteors and it will appear in the Journal of
> >Geophysical Research.
> >
> >The electrophonic sounds, which are heard simultaneously with an
> >appearance of a bright meteor, are a longstanding astronomic mystery.
> >This is the contra-intuitive phenomenon: normal sounds from a meteor
> >should be heard couple of minutes after the meteor, similarly as thunder
> >lags behind distant lighting. A full evaluation of the electrophonic
> >phenomenon was undermined by the lack of instrumental recordings - only
> >witness reports existed.
> >
> >In the article, we present the first instrumental recording of the
> >electrophonic sounds detected during the 1998 Leonid meteor storm over
> >Mongolia. We demonstrate that the physical characteristics of
> >electrophones from Leonid meteors cannot be explained satisfactory in
> >the framework of the existing theories. In addition, it is suggested
> >that the coupling of meteors to atmospheric charge dynamics and
> >ionosphere is much stronger than previously expected. This can have more
> >general implications, beyond the electrophonic phenomenon.
> >
> >Preprint of the article and additional information, pictures and videos
> >can be accessed at the project's web page:
> >http://fizika.org/ilwcro/results/
> >
> >More importantly, I would like to remind you about the project "Global
> >Electrophonic Fireball Survey", coordinated by D. Vinkovic from Univ. of
> >Kentucky (e-mail: dejan@ccsdot ukydot edu). The aim of the project is to
> >collect witness reports of the electrophonic sounds. If you experienced
> >electrophonic phenomena, please fill up the on-line form and make an
> >important contribution to the understanding of this effect. Web address:
> >http://gefs.ccsdot ukydot edu/
> >
> >
> >Greetings,
> >
> >Slaven Garaj
> >
> >Institute of Nuclear Engineering (IGA)
> >Department of Physics
> >Swiss Federal Institute of Technology Lausanne (EPFL)
> >CH-1015 Lausanne
> >Tel.: +41 (21) 693 4337
> >Fax: +41 (21) 693 4461
> >e-mail: slaven.garaj@epfl.ch
> >homepage: http://nanotubes.epfl.ch/garaj/
> >
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> >
>
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--
Wayne T. Watson (121.015 Deg. W, 39.262 Deg. N, 2,701 feet), Nevada City, CA
""Insanity is hereditary; you can get it from your children." -- Sam Levinson
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