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

From: Graham Ensor <graham.ensor_at_meteoritecentral.com>
Date: Sun, 17 Feb 2013 12:41:28 +0000
Message-ID: <CAJkn+kZebhVOqi8FS0jLT+1ChWny+Tj+EAJUSVnrQm8sDkv2Nw_at_mail.gmail.com>

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
>
>
>
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Received on Sun 17 Feb 2013 07:41:28 AM PST