Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmgp23a..02k&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #GP23A-02
Physics
6030 Magnetic Fields And Magnetism, 6218 Jovian Satellites, 6280 Saturnian Satellites
Scientific paper
Galileo and Cassini spacecraft have made close approaches to nine of the large (radius > 250 kms) icy satellites of the solar system. The magnetic data from these flybys have provided us a wealth of information on the induced and permanent fields of these satellites. The magnetic field measurements have been inverted to reveal the interior structures of these moons and to learn how these moons interact with the magnetospheres of Jupiter and Saturn. In this talk, I will first summarize the magnetic field observations from the icy Galilean satellites of Jupiter. After presenting the evidence of internal magnetic field in Ganymede, the solar system's largest moon, I will discuss the discoveries and implications of the induced magnetic fields in Europa, Ganymede and Callisto. It is now well accepted that the induction fields in these satellites arise from eddy currents flowing in the subsurface oceans in response to the rotating field of Jupiter. The exploration of the icy satellites of Saturn has just begun. Cassini has already made close flybys of Enceladus, Tethys, Dione, Rhea and Hyperion. Magnetic field observations from Enceladus have led to the discovery of water plumes originating from the south polar region of this moon. It is now believed that a subsurface liquid water aquifer maintains these geysers on Enceladus. Finally I will discuss the status of induction fields in the Saturnian moons, and the future plans of the Cassini team for additional magnetic field measurements of the Saturnian moons.
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