Comparative thermal history of satellites for magnetic field generation

Details Comparative thermal history of satellites for magnetic field generation Comparative thermal history of satellites for magnetic field generation

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..860k&link_type=abstract

European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a

Computer Science

Scientific paper

Ganymede is known to have an intrinsic magnetic field,which is supposed to be driven by dynamo action in metallic core. This is a contrasting feature to the absence of magnetic field in the Moon and Mars,which have comparable or even larger size of the silicate-metallic core. We consider this diversity would stem from variations of thermal history. We have performed calculations of the thermal history for several supposed interior models to evaluate possibility of the dynamo action in the metallic core. The focussed points are; 1) Whether sufficient heat can be extracted from the metallic core by the silcate mantle, and 2) Whether the metallic core is in molten state. By using these two points as a necessary condition for the dynamo action we explored admissible range of the internal structure of Ganymede. We found the plausible situation favoring for the dynamo can exit only in recent times. This suggests the magnetic field of Ganymede has appeared quite recently, which is contrasting to the martian case,where the dynamo already ceased at old times. We shall discuss possible control of the initial state and the composition over the variations of thermal history.

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