Does The Magnetic Field In The Fluid Core Contribute A Lot To Earth Nutation?

Details Does The Magnetic Field In The Fluid Core Contribute A Lot To Earth Nutation? Does The Magnetic Field In The Fluid Core Contribute A Lot To Earth Nutation?

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..16e..28h&link_type=abstract

Nomenclature, Precession and New Models in Fundamental Astronomy, 26th meeting of the IAU, Joint Discussion 16, 22-23 August 200

Astronomy and Astrophysics

Astronomy

Scientific paper

The existence of relative nutational motions between the liquid core and its surrounding solid parts induces a shearing of the magnetic field. An incremental magnetic field is then created, which perturbs the nutations themselves. This problem has already been addressed within a nutation model by Buffett (1992, Paper 1) and Buffett et al. (2002, Paper 2). These authors used an angular momentum budget approach, and their results are taken into account in the MHB nutation model. In this work, the magnetic field influence is incorporated in the numerical integration method used in precise nutation theory. New equations for that problem and new boundary conditions inside the Earth are developed, and a new strategy to compute nutations is established. The Coriolis force, which is ignored in Paper 1 is included in our work. Our results show that the change of the free core nutation period is very consistent with the change in the main nutation (18.6-year and retro-annual) terms. Comparisons of these results with Paper 1 and 2 are made, and discussions on the contribution of the Coriolis force and the magnetic field itself on the coupling constants will also be presented. Our approach offers promising perspectives for new computations of the Earth's nutations, tides, and the influence of considering a reference magnetic field within the reference state of the Earth.

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