Grott, M. and Sohl, F. and Hussmann, H. (2007) Degree-one convection and the origin of Enceladus’ dichotomy. In: 4th International Meeting of the Asia Oceania Geosciences Society, PS11-A0011. 4th International Meeting of the Asia Oceania Geosciences Society (AOGS), 2007-07-30 - 2007-08-04, Bangkok, Thailand.
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Recently, the Cassini spacecraft has detected ongoing geologic activity near the south pole of Saturn’s moon Enceladus. In contrast, its north-polar region is heavily cratered and appears to have been geologically inactive for a long time. We propose that this hemispheric dichotomy is caused by the satellite’s interior dynamics and that a degree-one convection pattern is driving the south-polar activity. We investigate a number of core sizes and internal heating rates for which degreeone convection occurs. The numerical simulations imply that a core radius of less than 120 km and an energy input at a rate of 3.0 to 5.5 GW would be required for degree-one convection to prevail. This is within the range of the observed thermal power release near Enceladus’ south pole. Provided that Enceladus is not fully differentiated, degree-one convection is found to be a viable mechanism to explain Enceladus’ hemispheric dichotomy.
|Document Type:||Conference or Workshop Item (Speech)|
|Title:||Degree-one convection and the origin of Enceladus’ dichotomy|
|Journal or Publication Title:||4th International Meeting of the Asia Oceania Geosciences Society|
|In ISI Web of Science:||No|
|Keywords:||convection, Enceladus, icy moons|
|Event Title:||4th International Meeting of the Asia Oceania Geosciences Society (AOGS)|
|Event Location:||Bangkok, Thailand|
|Event Type:||international Conference|
|Event Dates:||2007-07-30 - 2007-08-04|
|Organizer:||Asia Oceania Geosciences Society|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Space (old)|
|HGF - Program Themes:||W EW - Erforschung des Weltraums|
|DLR - Research area:||Space|
|DLR - Program:||W EW - Erforschung des Weltraums|
|DLR - Research theme (Project):||W - Vorhaben Vergleichende Planetologie (old)|
|Institutes and Institutions:||Institute of Planetary Research > Planetary Physics|
|Deposited By:||Stefanie Musiol|
|Deposited On:||22 Aug 2007|
|Last Modified:||27 Apr 2009 14:16|
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