Rotation and impact of the Earth's core on Earth's rotation

Details Rotation and impact of the Earth's core on Earth's rotation Rotation and impact of the Earth's core on Earth's rotation

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.g43b0811b&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #G43B-0811

Physics

5430 Interiors (8147), 5450 Orbital And Rotational Dynamics, 1213 Earth'S Interior: Dynamics (8115, 8120), 1239 Rotational Variations

Scientific paper

This paper investigates the dynamical behavior of a liquid core inside the Earth related to the mantle by inertial coupling. The core-mantle interaction was included in a realistic model of the Earth's rotation, the SONYR model (acronym of Spin-Orbit N-bodY Relativistic model). This model integrates simultaneously the spin-orbit N-body problem and permits to identify the different families of librations/nutations of the terrestrial planets, with special emphasis on the Earth's rotational motion. By using the SONYR model, we study the impact of the core on the rotational motion of the Earth. By comparing the rotation of the Earth considered as a homogeneous body with the rotation of an Earth model with two layers, we establish the signature of the core motion on the librations. We estimate the well-known proper frequencies of the Free Core Nutation and the Chandler Wobble for the two-layer Earth model. Moreover, we investigate for the first time in detail the motion of the core inside the mantle and find, for periods of the order of a year, that the core motions have a larger amplitudes than those of the dynamical motions of the mantle. We present results obtained for various initial conditions and for various oblatenesses.

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