Mathematics – Probability
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...81..220o&link_type=abstract
Icarus (ISSN 0019-1035), vol. 81, Oct. 1989, p. 220-241.
Mathematics
Probability
163
Europe, Heat Transmission, Land Ice, Rheology, Thermal Conductivity, Polar Wandering (Geology), Surface Temperature, Temperature Dependence, Thermodynamic Equilibrium, Jupiter, Satellites, Europa, Ice, Thermal Properties, Thickness, Water, Rheology, Temperature, Dissipation, Conductivity, Mantle, Timescale, Rotation, Polar Wandering, Friction, Tidal Effects, Calculations, Equilibrium, Models, Viscosity, Depth, Parameters
Scientific paper
The thickness of the ice shell presently hypothesized for Europa, which is decoupled from a silicate core by a liquid water layer, is calculated as a function of colatitude and longitude under suitable assumptions for two plausible ice rheology behaviors: that of Maxwell type, and that of generalized flow-law rheology. Due to the dissipation rate's pronounced temperature dependence, virtually all tidal dissipation is found to concentrate in the lowest few kilometers of the shell. While for some parameter choices an insulating regolith that raises the near-surface temperature by more than a few tens of degrees C may stabilize the shell against polar wander, a modest regolith may enhance the probability of such wander's occurrence through the reduction of the shell's retarding friction.
Ojakangas G. W.
Stevenson Jacob D.
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