(meteorobs) [VLF_Group] Chelyabinsk Fireball and electrophonic "noise."

[Bob Culbertson]

This passage of a brilliant meteor and an extraneous sound in the receiving
circuit has been known since 1921. Page 225 of the first attachment.
The second attachment page 226 at the top; with passage of a meteor a sharp
hiss that began and ended with the meteor.
Note the frequency here is not VHF or even HF but rather at LF with a CW
coast station transmitting in Bordeaux France observed in Seabrook Beach
New Hampshire.
Last attachment may help explain the propagation mode; Meteor Induced
Sporadic E.
Using 'Radio-Eyes' and going back to August 29, 1921, I found the
propagation direction did not come from the Perseids as mentioned here but
rather the kappa Cygnids that actually passed through the Perseids on their
way West.
Amazing the things we can do today. Equally amazing is what we have lost.
Bob WA3YGQ



On Wed, Apr 3, 2013 at 12:00 AM, Cliff Sojourner <cls at employees.org> wrote:

>
> my friend is an avid astronomer and chases eclipses and meteor showers
> and such...
>
> he assures me there is a sound, a hissing sound, from the brightest
> meteors.  he likes to go to the quietest place in the Sierra Nevadas
> during the busiest showers, watch and photograph, and especially
> listen.  He resents getting old, the sound is elusive now...
>
> Cliff K6CLS  CM87
>
> On 2013-04-02 08:09, drobnock wrote:
> > If this was presented earlier,  sorry.
> >
> > On a forum identified as Nasa Space Flight .com there was a question
> > asked about the Chelyabinsk Fireball and electrophonic "noise."
> > According to the article presented from Russia, 27 individuals heard a
> > hissing during the event. Note the question marks are part of the
> > Russian Text. with rough translation from an on line survey about the
> > event.
> >
> > George John Drobnock
> >
> > Question posted  2/17/2013 on the Nasaspaceflight.com.
> > ""I would also be very interested in eyewitness reports of electrophonic
> > sound PRIOR to the acoustic shock -- that is, during the brightest
> > flaring of the fireball. This is a at-long-last well-established effect
> > of plasma-generated radio noise coupling into near-observer physical
> > objects and creating a hissing or whooshing sound. It occurs simo with
> > the visual flares, seems to come from 'all around' [not from above], has
> > been reported for centuries by some bright fireball witnesses and
> > pooh-poohed by scientists until work by Colin Keay and others
> > established its validity.""
> >
> > Later Response posted.
> >
> > http://www.chel-meteorit.youini.ru/
> > Approximate translation: Profile observations falling meteorite
> > Chelyabinsk February 15, 2013
> >
> > http://chelyabinsk.ru/text/newsline/625214.html
> > is titled
> > **?????, ???????????? ??? ???????????, ???????? «????????»**
> > **Chelyabinsk Fireball turned out to be "sounding"**
> >
> > ""Article says 27 eyewitnesses independently noted that they heard weak
> > but clear hissing sounds DURING the flight. Many of them compared the
> > sound with "Bengal sparkler" (Popular in Russia type of hand-held light
> > firework) and noted that could not determine neither the source of
> > hissing nor direction it came from.
> >
> > This information was gathered via internet-form for eyewitness reports
> > here:
> > http://www.chel-meteorit.youini.ru/
> > I'd like to note that there is no direct question in the form about this
> > effect, the respondents were NOT prompted to describe it, they all did
> > it in "Additional Comments" field.""
> >
> > http://chelyabinsk.ru/text/newsline/625214.html
> > http://forum.nasaspaceflight.com/index.php?topic=31118.465
> >
> >
>
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