par, - 19 décembre 2017
Thesis : Felix Gerick, supervisors : Dominique Jault, Jérôme Noir (ETH Zürich)
Nowadays, the main Earth’s magnetic field is accurately monitored from satellites placed on a low orbit. Together with records of the Earth’s rate of rotation,the magnetic field observations give precious information about magnetohydrodynamic waves in the Earth’s fluid core. The propagation of these waves is sensitive to the properties of the core-mantle boundary : height of the interface with respect to a mean sphere ; electrical conductivity of the solid mantle adjacent to the fluid core. The aim of the study is to develop a 2-D reduced model of the fluid dynamics that would account for the non-spherical core-mantle boundary. The simplification of the model rests on the invariance of the fluid velocity parallel to the rotation axis. The Zürich group has already used such a model to investigate thermal convection without a magnetic field whereas the Grenoble group has used a similar model to investigate the propagation of magnetic waves in a perfectly spherical cavity. The thesis consists in combining the two approaches. It has started the 1st of November 2017. Felix will spend half of his thesis time at ETH Zürich.
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