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(meteorobs) "Electrophonic" sounds
Dear All,
Those who are interested in electrophonic sounds could read my debates with
C.Keay at my www-page:
http://www.geocities.com/olkhov/electro1.htm
Best wishes,
Andrei Ol'khovatov
Russia, Moscow
-----Исходное сообщение-----
От: Dr. Tony Phillips <phillips@spacescience.com>
Кому: meteorobs@atmob.org <meteorobs@atmob.org>
Дата: 15 августа 2002 г. 7:01
Тема: Re: (meteorobs) "Electrophonic" Fireball sound nonsense
>Hi Mike,
>
>Below you calculate that the VLF power from a fireball is roughly
>equivalent to one strong VLF radio station. Because there are 60 such
>stations worldwide, you conclude that VLF emissions from a fireball would
>be smothered by the ambient VLF background.
>
>The very same reasoning would lead you to conclude that WWVB itself is
>smothered by the ambient VLF background, because WWVB, according to your
>calculations, is only a little more powerful than a meteor.
>
>If a fireball can emit as much VLF power as WWVB, then that makes the
>fireball a pretty good transmitter.
>
>Regards, Tony
>
>At 09:36 PM 8/14/2002 -0400, you wrote:
>>I checked the WWVB website, and they state that normally nighttime field
>>strengths for their transmitter are at least 100uV/m^2 over most of North
>>America. Converting units, this yields power density P (uW/cm^2) =
>>3.77*10^-8 * (field strength)^2 = 3.77*10^-4 = 0.000377 uW/cm^2.
>>
>>So, the ambient background VLF from just ONE station is already on the
>>same order of magnitude as the meteor electrophonics, as I estimated.
>>There are at least 60 stations worldwide with similar output power and
>>many will have overlapping coverage areas, therefore it does appear the
>>electrophonics will be smothered in the VLF "noise".
>>
>>Mike Linnolt
>>
>>--- "Dr. Tony Phillips" <phillips@spacescience.com> wrote:
>> > At 08:27 PM 8/14/2002 -0400, you wrote:
>> > >Well, I believe the 0.003uW/cm^2 RF background
>> > includes all frequencies.
>> >
>> > To make a fair comparison, it's necessary to know
>> > what fraction is VLF and
>> > what fraction is not. If the ambient VLF background
>> > is 0.0003uW/cm^2, for
>> > example, the argument that meteors cannot rise above
>> > the background noise
>> > no longer holds.
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>
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