Grott, M. and Sohl, F. and Hussmann, H. (2007) Degree-one convection and the origin of Enceladus’ dichotomy. Icarus, 191 (1), pp. 203-210. Elsevier. DOI: 10.1016/j.icarus.2007.05.001. ISSN 0019-1035.
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Recently, the Cassini spacecraft has detected ongoing geologic activity near the south pole of Saturn’smoon Enceladus. In contrast, the satellite’s 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 interior dynamics with degree-one convection driving the south-polar activity. We investigate a number of core sizes and internal heating rates for which degree-one convection occurs. The numerical simulations imply that a core radius of less than 100±20 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.
|Title:||Degree-one convection and the origin of Enceladus’ dichotomy|
|Date:||1 November 2007|
|Journal or Publication Title:||Icarus|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 203-210|
|Keywords:||Saturn, satellites; Enceladus; Geophysics; Interiors; Thermal histories|
|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:||07 Nov 2007|
|Last Modified:||27 Apr 2009 14:27|
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