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!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Feb 17 2013, 03:25 AM
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
QUOTE (Helvick) Thunder rumbles aren't generally echoes, just the delayed arrival of the shock wave from points along the strike... That is what I had concluded and was going to post here. And remember although the contrail looks like it is just up on the ceiling, it is many miles long and every part of it has a different range in miles and therefore arrival times. And when the object disintegrated, there were thousands of fragments released, each making their own shock wave.And the videos confirm the conceptual model of the object disintegrating. As it entered ( I keep wanting to say "reentry") it was solid and made a compact plasma sheath perhaps 30 meters diameter. The smoke trail is ablated silicates that have condensed. When the object ruptures it immediately creates thousands of fragments ranging size from boulders to dust, each with it's own aerodynamic characteristics and trajectory and the surface:volume ratio increases rapidly and so does the amount of material being ablated. The plasma sheath rapidly expands due to the unconstrained fragments and the increase in the volume of plasma from vaporized silicates and whatever volatiles were entrained in the rock. Whew. It's mind-boggling. --Bill -------------------- |
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Feb 17 2013, 12:29 PM
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
When the object ruptures it immediately creates thousands of fragments ranging size from boulders to dust, each with it's own aerodynamic characteristics and trajectory and the surface:volume ratio increases rapidly and so does the amount of material being ablated. This is the explanation I subscribe to as well. Each of those separate fragments would see a significantly different deceleration depending on its ballistic coefficient so the fragment train would quickly spread out in along-track direction, creating all those distinct, subsequent booms. -------------------- |
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Feb 17 2013, 02:48 PM
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
...Each of those separate fragments would see a significantly different deceleration depending on its ballistic coefficient so the fragment train would quickly spread out in along-track direction, creating all those distinct, subsequent booms. Exactly the point I made. The multiple booms were sonic booms created by the fragments of the original impactor after the initial explosion. -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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