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 18 2013, 04:24 AM
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
I've been doing some reading and the closest "terrestrial" analog to the dust trail left by the Russian bolide is a nuee ardente (literally, "glowing cloud") pyroclastic flow, at least the lighter airborne fraction and not the ground-hugging surge:
QUOTE nuee ardente 1) glowing avalanche (lower denser part) 2) Lighter fraction of volcanic gases, ash, and dust which cauliflower upwards. http://www.volcanolive.com/a.html A quickie Google link on this is: http://www.google.com/search?q=nuee+ardente As the meteorite disintegrated and ablated it became, literally, a plasma of vaporized basalt plus volatiles and gasses which immediately started to condense into a basaltic (volcanic) ash with very hot gasses which was quite buoyant and made the observed cauliflower clouds along the trail. Parts of the cauliflower puffs were still incandescent (literally seconds after formation), which sets a range of temperatures. I've been looking at a lot of images of the "nuee ardente" flows but haven't seen any that are still glowing (not a surprise, we're seeing a volcanic eruption late on the game). This event is going to make for a some great papers at next year's LPSC... --Bill -------------------- |
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