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Degree-one convection and the origin of Enceladus’ dichotomy

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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Abstract

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
Authors:
AuthorsInstitution or Email of Authors
Grott, M.UNSPECIFIED
Sohl, F.UNSPECIFIED
Hussmann, H.UNSPECIFIED
Date:July 2007
Journal or Publication Title:4th International Meeting of the Asia Oceania Geosciences Society
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:PS11-A0011
Status:Published
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)
Location: Berlin-Adlershof
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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