Different tidal torques on a planet with a dense atmosphere and consequences to the spin dynamics

Details Different tidal torques on a planet with a dense atmosphere and consequences to the spin dynamics Different tidal torques on a planet with a dense atmosphere and consequences to the spin dynamics

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgre..108.5123c&link_type=abstract

Journal of Geophysical Research, Volume 108, Issue E11, pp. 9-1, CiteID 5123, DOI 10.1029/2003JE002059

Physics

Geophysics

9

Meteorology And Atmospheric Dynamics: Waves And Tides, Geodesy And Gravity: Rotational Variations, Geodesy And Gravity: Tides-Earth, Mathematical Geophysics: Modeling, Planetary Sciences: Orbital And Rotational Dynamics

Scientific paper

Planets with a dense atmosphere present not only traditional gravitational and thermal tides, but also combined effects resulting from these two: gravitational torque upon pressure bulge, pressure torque upon tidal bulge, and pressure torque upon pressure bulge. Here we give a complete description of these effects and evaluate their relative contributions to the secular evolution of the planet's spin. In particular, we discuss the importance of determining the exact transfer mechanism of angular momentum from the atmosphere to the surface. It is shown that alternative atmospheric tides may play an important role if this transfer rate is not very effective, although this does not seem to be the present case on Earth or Venus.

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