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: 3241 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 16 2013, 10:01 PM
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Member Group: Members Posts: 716 Joined: 3-January 08 Member No.: 3995 |
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Feb 16 2013, 11:03 PM
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Dublin Correspondent Group: Admin Posts: 1799 Joined: 28-March 05 From: Celbridge, Ireland Member No.: 220 |
Thunder rumbles aren't generally echoes, just the delayed arrival of the shock wave from points along the strike that are further from you and travelling through fairly chaotic air ( initially at least ).
This should be similar, this thing was hypersonic ( mega sonic?) at 100's of km out, rapidly decelerating to merely supersonic by the time it passed overhead. At 30 km altitude it would have taken about 2 minutes for the shock to reach ground directly beneath the closest point below the main explosion, with earlier shocks gradually catching up, and being increasingly faint over the following minute or two as they caught up. The pops and barrage effect could be just interference along the path but I think its reasonable to assume that there were fragments spalling off and exploding all along the track up to the main fireball providing most of the variation in that recording. The speed of sound is very slow when you are hearing stuff from 30-60 km away, and that looked like a very bumpy ride in to me, even before the main event. |
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Feb 16 2013, 11:38 PM
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Member Group: Members Posts: 716 Joined: 3-January 08 Member No.: 3995 |
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