Observations of luni-solar and free core nutation

Details Observations of luni-solar and free core nutation Observations of luni-solar and free core nutation

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.1889m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, Nov. 1991, p. 1889-1895.

Physics

Geophysics

20

Earth-Moon System, Geodynamics, Nutation, Solar System, Astrometry, Earth Core, Earth Rotation, Geophysics, Solar Terrestrial Interactions, Very Long Base Interferometry

Scientific paper

An analysis of the differences between observed nutation angles and the 1980 IAU nutation theory shows the existence of currently unmodeled effects. An empirical set of corrections to the 1980 IAU nutation theory is presented and compared with current geophysical models. A retrograde periodic variation (period about 418 days), which may be related to the theoretical free core nutation, is seen.

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