Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.p12c..02k&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #P12C-02
Physics
2732 Magnetosphere Interactions With Satellites And Rings, 5440 Magnetic Fields And Magnetism, 6030 Magnetic Fields And Magnetism, 6062 Satellites, 6218 Jovian Satellites
Scientific paper
The magnetic properties of differentiated bodies of the solar system give valuable insight into the properties of their interiors. It is generally accepted that a permanent magnetic moment requires a fluid conducting layer in the interior, although in some cases, remanent magnetism has been suggested as a source of an internal field. Of the four Galilean satellites, only Ganymede was found to have a significant permanent magnetic moment. Orbital perturbations as Galileo passed near Ganymede are consistent with a metallic core and some scenarios of thermal evolution are compatible with the presence of metallic fluid in the core. The small values of internal moments of higher than dipole order are consistent with a deeply buried core. There is now evidence that the three icy Galilean moons of Jupiter respond inductively to the periodic rocking of the magnetic field of the Jovian magnetosphere. Inductive fields of detectable amplitude must be driven by currents that flow close to the surface, and therefore an inductive response implies a current-carrying layer in the outer ice shell. Although the evidence for the inductive response is clear, the signatures are partially masked by the presence of perturbation fields arising from currents flowing in the ambient plasma. Models that correct for the externally driven perturbations and improve our ability to constrain internal moments will be discussed. The complexity of the plasma signatures around Io have restricted our ability to place useful upper limits on its permanent magnetic moment, but estimates will be presented. If time permits, we will comment on expectations for Cassini's observations at Titan.
Galland Kivelson Margaret
Khurana Krishan K.
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