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Tidal resonance in icy satellites with subsurface oceans

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/60730

Title: Tidal resonance in icy satellites with subsurface oceans
Authors: Kamata, Shunichi Browse this author
Matsuyama, Isamu Browse this author
Nimmo, Francis Browse this author
Issue Date: Sep-2015
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research Planets
Volume: 120
Issue: 9
Start Page: 1528
End Page: 1542
Publisher DOI: 10.1002/2015JE004821
Abstract: Tidal dissipation is a major heat source for the icy satellites of the giant planets. Several icy satellites likely possess a subsurface ocean underneath an ice shell. Previous studies of tidal dissipation on icy satellites, however, have either assumed a static ocean or ignored the effect of the ice lid on subsurface ocean dynamics. In this study, we examine inertial effects on tidal deformation of satellites with a dynamic ocean overlain by an ice lid based on viscoelasto-gravitational theory. Although ocean dynamics is treated in a simplified fashion, we find a resonant configuration when the phase velocity of ocean gravity waves is similar to that of the tidal bulge. This condition is achieved when a subsurface ocean is thin (<1 km). The enhanced deformation (increased h(2) and k(2) Love numbers) near the resonant configuration would lead to enhanced tidal heating in the solid lid. A static ocean formulation gives an accurate result only if the ocean thickness is much larger than the resonant thickness. The resonant configuration strongly depends on the properties of the shell, demonstrating the importance of the presence of a shell on tidal dissipation.
Rights: © 2015 American Geophysical Union
Type: article
URI: http://hdl.handle.net/2115/60730
Appears in Collections:創成研究機構 (Creative Research Institution) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鎌田 俊一

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