Thin-shell Tidal Dynamics of Ocean Worlds
نویسندگان
چکیده
Abstract Several solar system moons harbor subsurface water oceans; extreme internal heating or irradiation can form magma oceans in terrestrial bodies. Tidal forces drive ocean currents, producing tidal that affects the thermal−orbital evolution of these worlds. If outermost layers (ocean and overlying shell) are thin, dynamics be described using thin-shell theory. Previous work assumed shell's thickness density uniform. We present a formulation relaxes assumptions apply it to several cases interest. The response unstratified constant is given by surface gravity Rossby waves, which resonate with force. outer too thick for wave resonances, but high-amplitude waves excited high orbital obliquity. find meridional variations hinder excitation decreasing dissipation increasing inclination damping timescale, allows us reconcile Moon existence past long-lived explain Titan Callisto without invoking recent excitation. Stratified support waves. show due exceed resulting from For Enceladus, close moon’s thermal output, even if weakly stratified. Shear result Kelvin–Helmholtz instabilities induce mixing.
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ژورنال
عنوان ژورنال: The planetary science journal
سال: 2023
ISSN: ['2632-3338']
DOI: https://doi.org/10.3847/psj/acae9a