[meteorite-list] Dark area in front of Cherbakul bolide

From: Vincent . <meteorh3_6_at_meteoritecentral.com>
Date: Sun, 24 Feb 2013 20:50:43 +0100
Message-ID: <DUB119-W396441DF023CD546355F9F9F20_at_phx.gbl>

Hello,
I assume, the term "dark mass" isn't adequate. I should have written "dark area" to be correct. Of course it's not a solide body, because it is flooded in the plasma.
 
I do not know what it is, but this dark area moves for 1/2 seconds in front of the fireball. It shows something similar to a compression wave in front of bolide.
Ok, this could be an effect of saturation pixel, photographic artifact, or others atmospherics effects. Others movies don't show it, but the quality was not very good and/or the cameras were placed differently in relation to the bolide path.
However, this picture, very well informed, has the merit of launching a new debate on Cherbakul bolidel.
This link http://www.cddc.vt.edu/host/atomic/nukeffct/enw77b1.html explains the propagation of atomic shockwaves with interesting pictures of shockwave propagation:
 
extract:
 
THE BLAST WAVE
2.32 At a fraction of a second after a nuclear explosion, a high-pressure wave develops and moves outward from the fireball (Fig. 2.32). This is the shock wave or blast wave, mentioned in ? 1.01 and to be considered subsequently in more detail, which is the cause of much destruction accompanying an air burst. The front of the blast wave, i.e., the shock front, travels rapidly away from the fireball, behaving like a moving wall of highly compressed air. After the lapse of 10 seconds, when the fireball of a 1-megaton nuclear weapon has attained its maximum size (5,700 feet across), the shock front is some 3 miles farther ahead. At 50 seconds after the explosion, when the fireball is no longer visible, the blast wave has traveled about 12 miles. It is then moving at about 1 ,150 feet per second, which is slightly faster than the speed of sound at sea level.
 
Enjoy :-)
Vincent

> From: falcon99 at sbcglobal.net
> Date: Sat, 23 Feb 2013 22:26:52 -0600
> To: clp at alumni.caltech.edu
> CC: meteorite-list at meteoritecentral.com
> Subject: Re: [meteorite-list] Dark mass in front of Cherbakul bolide + raining meteorites
>
> Sorry Chris. Meant to reply to Vince's post.
>
> Sent from my iPad
>
> On Feb 23, 2013, at 11:17 AM, Chris Peterson <clp at alumni.caltech.edu> wrote:
>
> > There can be no dark object in front of a fireball. It is the leading face of the body that is generating the pressure front and heating the air, resulting in ablation and the light we see.
> >
> > Keep in mind the scale, as well. We're seeing a ~15 meter diameter body (and in every other reported case, even smaller) at a minimum distance of 30 km (and in most cases farther). That means the entire body subtends a mere 2 arcmin, right around the resolution of the human eye, and typically smaller than the resolution of a camera.
> >
> > I suspect that observations and images of any such thing are the product of various artifacts, both visual and photographic. Also possible are atmospheric effects related to the supersonic shockwave or compression zone. But not a physical body, I think.
> >
> > Chris
> >
> > *******************************
> > Chris L Peterson
> > Cloudbait Observatory
> > http://www.cloudbait.com
> >
> > On 2/23/2013 9:54 AM, Vincent . wrote:
> >>
> >> sorry if double mail
> >>
> >> Dear all,
> >> When a very big bolide is observed, some witnesses explain the observation of "the" meteorite parent, just in front of bolide.
> >> I wanted to check this very unknow phenomen.
> >> I decomposed some video from Chelyabinsk bolide. One of them shows a dark mass in front of the bolide!!! It seem rotating. The dark mass is visible during approx 1/2 second. Some details are visible 3/10 second later during 2/10 seconds.
> >> With an exciting surprise, the end of path, 1 second later show the fragmentation of two medium mass. One of them create a veritable "plume" in the sky. Perhaps the beginning of a rain meteorite?
> >> If this is really the explosion of a meteroite mass in sky and/or the real "asteroid" falling in the atmosphere, then that's is the first time that the phenomen is recorded! I'll be very happy to have it discovered.
> >> Photos are visible ==> http://www.flickr.com/photos/93493758 at N04/ Enjoy!!
> >>
> >> Kind regards
> >> Vincent
> >
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Received on Sun 24 Feb 2013 02:50:43 PM PST