INCOMING!: метеорита в Челябинске, Russian Meteor - February 2013 |
INCOMING!: метеорита в Челябинске, Russian Meteor - February 2013 |
Feb 15 2013, 07:01 AM
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Senior Member Group: Moderator Posts: 3233 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Looks like a small meteoroid decided to spoil 2012 DA14's big day by exploding over Russia...
http://zyalt.livejournal.com/722930.html?nojs=1 -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
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Feb 17 2013, 10:10 PM
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Member Group: Members Posts: 404 Joined: 5-January 10 Member No.: 5161 |
I don't know if this has been discussed yet, and maybe don't understand this well enough, but the succession of booms heard from the ground might have been in reverse order for most locations where it was heard. Especially directly under the main trail. The meteor came punching into the atmosphere well beyond the speed of sound, so all propagating explosions and shock waves could not keep up with the front of the train. Let's say you were standing directly below that main explosion that remained incendiary for a few seconds. The shock wave from that would hit you first. What about all the other smaller shock waves preceding it? They would then strike your ears in succession, but in reverse order than actual time of origination.
The series of booms heard is the actual sound of the meteor's entry, but played out in reverse! For example, the first explosion of the meteor itself was the highest up there, and so will reach the ground last, since the train is moving much faster than speed of sound. This illustration comes to mind: Imaging being in a hot air balloon above a lake and spraying a machine gun in a direct line from one shore of the lake to the opposite shore. The waves from the last bullet shot will wash ashore first on that opposite side of lake, followed by the rest of them in reverse order. The first bullet fired will have hit that far shore last. Maybe there's something completely fundamental I'm overlooking. the idea seems too strange... |
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