Spin and atmospheric tides of Venus

Details Spin and atmospheric tides of Venus Spin and atmospheric tides of Venus

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60...85k&link_type=abstract

Astronomy and Astrophysics, vol. 60, no. 1, Aug. 1977, p. 85-91.

Astronomy and Astrophysics

Astrophysics

17

Atmospheric Tides, Planetary Rotation, Spin Reduction, Venus Atmosphere, Angular Momentum, Astronomical Models, Atmospheric Circulation, Orbital Resonances (Celestial Mechanics), Q Factors, Solar Heating, Spin Dynamics, Venus (Planet)

Scientific paper

Venus should not constitute an exception to the law that the solar-system secondaries were formed with an initial prograde spin rate of the order of 0.0002 per sec. Reviving Gold's (1964) idea, it is argued that braking by tidal torques and possibly magnetospheric friction can account for a spindown of Venus within some 1 billion years. Subsequent retrograde spinup via thermally driven atmospheric tides can explain the present slow retrograde rotation of the planet. Spin reversal has been achieved by a delicate interplay of one-sided solar heating, longitude-dependent solar attraction, and atmospheric mass asymmetry by means of which the present four-day atmospheric circulation was initiated just in time to reverse the rotation. The present spin period of 243.1 days cannot be understood as a stable spin-orbit resonance.

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