Statistics – Computation
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979m%26p....21..127l&link_type=abstract
Moon and the Planets, vol. 21, Oct. 1979, p. 127-154.
Statistics
Computation
16
Planetary Evolution, Planetary Rotation, Venus (Planet), Atmospheric Tides, Coupling, Euler Equations Of Motion, Friction, Numerical Integration, Planetary Cores, Spin Reduction, Tables (Data), Torque
Scientific paper
The past evolution of the rotation of Venus is examined by a numerical integration method based on the hypothesis that, originally, only solar tidal torques and core-mantle coupling have been active since formation. It is assumed that Venus evolved, in 4.5 billion years, from a rapid direct rotation to the present slow retrograde one. The effect of a liquid core is discussed and it is shown that core-mantle friction hastens the latter part of the evolution and makes the equilibrium state at 180 deg even stronger. The solid and atmospheric tidal torques are evaluated using classical Eulerian equations and the Cytherean obliquity, and a complete analysis of their computations is given. Attention is given to core-mantle coupling and the effect of viscous coupling on the rotation of the mantle, as well as the effect of secular evolution of obliquity and spin angular velocity on coreand non-core-mantle coupling.
Cazenave Anny
Lago Bernard
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