On the nutations of a more realistic earth model

Details On the nutations of a more realistic earth model On the nutations of a more realistic earth model

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990geoji.100..477d&link_type=abstract

Geophysical Journal International (ISSN 0955-419X), vol. 100, March 1990, p. 477-483.

Astronomy and Astrophysics

Astronomy

17

Earth Mantle, Earth Rotation, Nutation, Very Long Base Interferometry, Earth Tides, Elastic Properties, Models, Pressure Oscillations, Rheology

Scientific paper

The nutation series adopted by the IAU in 1979 (Seidelmann, 1982) is compared with VLBI, lunar laser ranging, and astronomical observations. Differences between the observations and the theoretical model for an elliptical uniformly rotating earth are examined. Consideration is given to the use of new rigid nutations and a new external potential, the introduction of mantle inelasticity in the earth model, and the effect of changes in the core flattening. It is found that the only very significant effect is core flattening, which explains the discrepancy between observational data and the amplitude adopted by the IAU for the annual component. Also, pressure change at the core-mantle boundary is introduced to study the sensitivity of nutation amplitudes to pressure changes at the boundary.

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