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 16 2013, 02:54 AM
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
I've been finger-licking the various videos, and I'm struck by the better views of the actual explosion. There is a flash and a rapid expansion of what looks like a spherical fireball, a very slight dimming, and a second much brighter flash in which the fireball expands enormously. As the fireball quickly dissipates, you see what looks like a very thin cloud of dark smoke that outlines a sphere about the size of the first fireball flash, which itself dissipates (or is drawn into the contrail) in less than a second.
The only lasting effect of the fireball was the thickening of the contrail. But the second flash of the double flash definitely generated a huge fireball that dissipated extremely quickly. I wonder if the fireball was made entirely of gasses or plasma? Or if any fragmental debris in the fireball was actually pulled back into the contrail by the extreme vacuum created in the wake of the impactor? I admit, I cheated a little bit in studying the fireball -- I found a youtube video that runs the best angles of the bolide's descent in slow motion: https://www.youtube.com/watch?v=gW6JVG1SP4c -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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