[meteorite-list] Boom 28 secs after Russian meteor passes overhead - oops 98 secs!

[Graham Ensor]

Ah....yes I had not noticed that and it was confusing me too as on
another video....which I have been trying to find it had a countdown
of time and that did match also at least 98 seconds.....wish I could
find that one again....looked at so many.

G

On Sun, Feb 17, 2013 at 4:54 AM, Robin Whittle <rw at firstpr.com.au> wrote:
> A list member kindly pointed out that there was more than a few seconds
> deleted from this video.  I didn't look at the minutes figure.
>
> The meteor is overhead at 43:06 and the shockwave arrives at 44.34.
>
> So this puts the altitude about three times the 8.7km estimated by Bob
> Matson.  From:
>
>
> http://en.wikipedia.org/wiki/Speed_of_sound#Altitude_variation_and_implications_for_atmospheric_acoustics
>
>   http://en.wikipedia.org
> /wiki/File:Comparison_US_standard_atmosphere_1962.svg
>
> the speed of sound varies somewhat.  Since this is a large positive
> pressure wave, maybe it would travel somewhat faster than a small
> pressure wave at these higher altitudes.  Sticking with the 310
> metre/sec guesstimate of Bob Matson, 98 seconds gives us 30.4 km.
>
>   - Robin
>
>
>
> ______________________________________________
>
> Visit the Archives at http://www.meteorite-list-archives.com
> Meteorite-list mailing list
> Meteorite-list at meteoritecentral.com
> http://six.pairlist.net/mailman/listinfo/meteorite-list