Enceladus Jet Sources |
Enceladus Jet Sources |
Oct 10 2007, 05:20 PM
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
New press release by the imaging team:
Cassini Pinpoints Hot Sources of Jets on Enceladus October 10, 2007 (Source: Space Science Institute) CICLOPS link to the release here. One thing I was curious about tiger stripe naming - why didn't they switch "Baghdad" and "Cairo" so we have a nice A,B,C,D progression? I can only imagine it was done on purpose, but why? -------------------- |
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Jun 25 2009, 08:38 PM
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
John, just for baseline purposes, what's the latest leading model for Enceladus' heat source? Was a single specific type (localized radioactive, global tidal with a south polar soft spot, etc.) postulated to derive these plume models?
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Jun 25 2009, 09:29 PM
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Member Group: Members Posts: 699 Joined: 3-December 04 From: Boulder, Colorado, USA Member No.: 117 |
It's gotta be tidal heat- radioactive heat isn't nearly enough. The questions involve where the heat is dissipated (in shallow fractures? More broadly throughout the south polar ice shell?) and what's happening with its orbit, and its interaction with Saturn and Dione, to keep the heating going.
John |
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Jun 25 2009, 10:56 PM
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#4
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
The questions involve where the heat is dissipated (in shallow fractures? More broadly throughout the south polar ice shell?) Is it fair to say, then, that the primary constraint on plume models might be the thickness of the ice shell? Seems like that would be largely a function of the amount of tidal heating. Re the localized nature of the plumes: Too bad that a decent gravimetric map of Enceladus seems pretty difficult to obtain. Willing to bet that there's some sort of asymmetry in the rocky part to account for this. -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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