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It is usually believed that the geo-dynamo of the Earth or more generally ofother planets, is created by the convective fluid motions inside their moltencores. An alternative to this thermal or compositional convection can howeverbe found in the inertial waves resonances generated by the eventual precessionof these planets or by the possible tidal distorsions of their liquid cores. Wewill review in this paper some of our experimental works devoted to theelliptical instability and present some new results when the experimental fluidis a liquid metal. We show in particular that an imposed magnetic field isdistorted by the spin- over mode generated by the elliptical instability. Inour experiment, the field is weak (20 Gauss) and the Lorenz force is negligiblecompared to the inertial forces, therefore the magnetic field does not modifythe fluid flow and the pure hydrodynamics growth rates of the instability arerecovered through magnetic measurements

Magnetic field induced by elliptical instability in a rotating tidally-distorted sphere