Tidal dissipation within large icy satellites: Applications to Europa and Titan

摘要: This paper describes a new approach based on variational principles to calculate the radial distribution of tidal energy dissipation in any satellite. The advantage model with respect classical solutions, is that it relates straightforward way time-averaged rate its sensitivity corresponding viscoelastic parameters. method applied Io-, Europa-, and Titan-like interiors, tested against results obtained by two methods determining global as well lateral distributions within satellite interiors. By exploring systematically different parameters defining interior models, we demonstrate presence deep ocean below an outer ice layer strongly influences both innermost part On one hand, imposing large displacement at base I layer, controls strain making field very weakly sensitive viscosity variations. Conversely, high-pressure ocean, are variation viscosity. other for identical structures mantle core, subsurface reduces strength silicate mantle. existence liquid Europa makes models less dissipative than predictions Io.