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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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