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EP: Fachverband Extraterrestrische Physik

EP 7: Poster Session Extraterrestrics

EP 7.14: Poster

Dienstag, 31. März 2009, 17:30–19:00, Foyer der Zahnklinik

Inductive response of Callisto's interior — •Mario Seufert and Joachim Saur — Institut für Geophysik und Meteorologie, Universität zu Köln, Deutschland

Callisto, one of the four large Galilean moons of Jupiter, is expected to have a subsurface ocean. Zimmer et al. [2000] showed, that the magnetic field measurements by the Galileo spacecraft can be explained by the inductive response of a two layer interior model of Callisto including a global conductive water shell. For this model the induction inside the moon occurs due to the variation of the Jovian background field by its rotational period and axis tilt. We present an extended model that includes a third layer and a secondary excitation period due to the eccentricity of Callisto's orbit. With this work we will be able to explain the magnetic field measured by the Galileo spacecraft in greater detail and expect to further constrain the properties of the anticipated ocean.