Tides of io

摘要: Jupiter's satellite Io is the most active earth-like planetary body in solar system with a surface heat flow of, at least, 2.5 W m−2, resurfacing rate of 1.3 cm a−1, and, possibly, self-sustained magnetic field. It universally accepted that activity driven by tidal energy dissipated Io's mantle. Tides amplitudes two orders magnitude larger than lunar tides on Earth are raised Jupiter. Since rotates synchronously its orbital revolution, substantial deformation requires an eccentric orbit. The eccentricity maintained Laplace resonance between inner Jovian satellites against damping induced dissipation interior. Models assume visco-elastic mantle rheology and require fluid (outer) core to allow sufficiently strong deformation. likely partially molten there may be asthenosphere or magmasphere underneath lithosphere. drawn from rotational transferred before part it satellite. Tidal thus sink balance source balances coupled through temperature dependent parameters. thermal-orbital evolution indicate quasi-stationary high state possible as well oscillations thermal A field unlikely state. time change orbit parameters such mean motion constrained astrometrical observation over past 300 years. These data can used constrain present rate. constraints order model transfer local hot spots where melt generated viscous proposed. This explain gap