Earth librations due to core-mantle couplings

Details Earth librations due to core-mantle couplings Earth librations due to core-mantle couplings

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jsrs.meet..150r&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 Core, Dynamics

Scientific paper

We present a study of the dynamical behavior of the liquid core inside the Earth related to the mantle by inertial coupling. In order to integrate the terrestrial core-mantle interaction in a realistic model of the Earth's rotation, we have used our SONYR model (Spin-Orbit N-bodY Relativistic model) of the Solar System including the Earth's spin-orbit motion. We obtain the dynamical behavior of the rotational motion of the Earth considered as a homogeneous body and as a model with two layers. The comparison of the dynamical evolution of these two models of internal structure permits to clarify the impact of the core's motion on the librations/nutations. We estimate the proper frequencies, the Free Core Nutation and the Chandler Wobble, of the two-layer Earth model. Moreover, we compute the dynamical motion of the core itself, and find that it has a larger amplitude than the dynamical motion of the mantle.

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