Influence of time variation in the second zonal harmonic on polar motion

Details Influence of time variation in the second zonal harmonic on polar motion Influence of time variation in the second zonal harmonic on polar motion

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985baicz..36...24b&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 36, Jan. 1985, p. 24-27.

Astronomy and Astrophysics

Astronomy

4

Geodynamics, Geopotential, Polar Wandering (Geology), Secular Variations, Zonal Harmonics, Earth Rotation, Euler Equations Of Motion, Nutation

Scientific paper

The dynamical consequences of the variation of the second zonal harmonic in the earth gravitational field (as revealed in analysis of the Lageos orbits by Yoder et al., 1983) for the polar motion (specifically, the Eulerian free motion) are investigated analytically. It is found that secular decrease in the second zonal harmonic causes a secular decrease in the Eulerian frequency, with a corresponding increase in the period of about 8.4 d/Myr and a decrease in wobble amplitude of about 3 x 10 to the -9th/cycle (based on linear approximations).

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