Excitation and relaxation of the wobble, precession, and libration of the moon

Details Excitation and relaxation of the wobble, precession, and libration of the moon Excitation and relaxation of the wobble, precession, and libration of the moon

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.1813p&link_type=abstract

Journal of Geophysical Research, vol. 81, Apr. 10, 1976, p. 1813-1827.

Other

13

Body Kinematics, Librational Motion, Moon, Nutation, Precession, Vibration Damping, Free Vibration, Lunar Core, Lunar Mantle, Lunar Orbits, Lunar Rotation, Lunar Tides, Nutation Dampers

Scientific paper

The rate of meteorite-impact excitation of the free wobble, free precession, and free libration of the moon above a given amplitude is estimated for two crater-size scaling laws and is compared with the rate of damping by tidal and rotational distortion as well as by a possible core-mantle interaction. Criteria for the probable existence and the probable nonexistence of observable amplitudes of the free motions are developed in terms of upper bounds on the damping factor for the various motions and in terms of ranges for the kinematic viscosity of a possible core. It is shown that although observable amplitudes are compatible with reasonable values of the damping factor and kinematic viscosity, other reasonable values could keep the amplitudes below the observable level most of the time. It is found that the free libration is the least likely motion to be observed and that a lunar core with earthlike properties might keep some of the free motions damped, but not all of them. Uncertainties in some of the assumptions used in the analysis are discussed.

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