Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jsrs.meet..101m&link_type=abstract
In: Journées 2004 - systèmes de référence spatio-temporels. Fundamental astronomy: new concepts and models for high accuracy obs
Astronomy and Astrophysics
Astronomy
1
Earth Rotation, Nutation
Scientific paper
The International Earth rotation and Reference system Service (IERS) provides observational determinations of the celestial pole offsets that describe quantitatively the difference between the observed direction of the Celestial Intermediate Pole in the celestial reference frame and the direction predicted by the conventional precession-nutation model. The free core nutation is the most significant component of that time series. This motion is due to the fact that the rotation axes of the core and mantle are not aligned, and it is seen in the observations as a periodic variation with a period of 432 days with time-variable amplitude and phase. The IERS is tasked with providing a numerical model for this motion. The current status of the free-core nutation models is reviewed and their accuracy is assessed.
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