A Model for the Polar Motion of the Deformable Earth Adequate for Astrometric Data

Details A Model for the Polar Motion of the Deformable Earth Adequate for Astrometric Data A Model for the Polar Motion of the Deformable Earth Adequate for Astrometric Data

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002arep...46...74a&link_type=abstract

Astronomy Reports, Volume 46, Issue 1, January 2002, pp.74-82

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Refined analytical expressions for the frequencies corresponding to the Chandler motion of the pole and the diurnal rotation of the deformable Earth are derived. Numerical estimates of the period and amplitude of the polar oscillations are presented. The trajectory of the Chandler polar motion derived via numerical modeling is in qualitative and quantitative agreement with experimental data from the International Earth Rotation Service (IERS). An evolutionary model describing slow variations in the Earth’s rotation parameters under the action of the dissipative moments of the tidal gravitational forces on time scales considerably longer than the precession period of the Earth’s axis is constructed. The axis of the Earth’s figure tends to approach the angular momentum vector of the proper rotation.

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