Libration of Large Satellites with a Possible Internal Ocean

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Scientific paper

The detection of an induced magnetic field in the vicinity of the Galilean satellites Europa, Ganymede, and Callisto by the Galileo mission suggests the existence of internal electrically conducting reservoirs of liquid water several tens of kilometers beneath the surface. The existence and dimensions of a liquid layer depends on the internal structure, composition and thermal state of the satellite. Interior models applied for Galilean satellites suggest that many, if not all of the large and medium-sized satellites with a large icy component could have a liquid water ocean beneath a solid ice shell. Besides evidence from magnetic field measurements, subsurface oceans can be detected by studying the satellite's deformation as well as the rotational variations. During an orbital revolution, the outer ice shell, subsurface ocean, and the solid interior of the satellite perform differential librations with respect to each other. Here, we investigate the use of libration observations of the outer shell in the determination of the existence and the properties of subsurface oceans, with a special emphasis on Europa.

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