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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: 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.

Item URL in elib:https://elib.dlr.de/51075/
Document Type:Conference or Workshop Item (Speech)
Title:Degree-one convection and the origin of Enceladus’ dichotomy
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Date:August 2007
Journal or Publication Title:2nd European Planetary Science Congress
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:EPSC2007-A-00010
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)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Deposited By: Musiol, Stefanie
Deposited On:29 Aug 2007
Last Modified:27 Apr 2009 14:18

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