Grott, M. and Sohl, F. and Hussmann, H. (2007) Degree-one convection and the origin of Enceladus’ dichotomy. In: 2nd European Planetary Science Congress, EPSC2007-A-00010. European Planetary Science Congress (EPSC), 2007-08-20 - 2007-08-24, Potsdam, Germany.
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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:||2nd European Planetary Science Congress|
|In ISI Web of Science:||No|
|Keywords:||convection, Enceladus, icy moons|
|Event Title:||European Planetary Science Congress (EPSC)|
|Event Location:||Potsdam, Germany|
|Event Type:||international Conference|
|Event Dates:||2007-08-20 - 2007-08-24|
|Organizer:||Europlanet (European Planetology Network)|
|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:||29 Aug 2007|
|Last Modified:||27 Apr 2009 14:18|
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