Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1080c&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1080
Astronomy and Astrophysics
Astrophysics
Scientific paper
The elliptical instability can take place in planetary cores and stars elliptically deformed by gravitational effects, where it generates large-scale threedimensional flows assumed to be dynamo capable. In this work, we present the first magneto-hydrodynamic (MHD) numerical simulations of such flows, using a finite-element method. We first validate our numerical approach by comparison with kinematic and dynamic dynamos benchmarks of the literature. We then systematically study the magnetic field induced by various modes of the elliptical instability from an imposed external field in a triaxial ellipsoidal geometry, relevant in a geo- and astrophysical context. Finally, we present our first steps towards demonstrating the existence of a tidal dynamo. Results for the solar system are presented and discussed.
Cébron David
Le Bars Michael
Le Gal Patrice
Maubert Pierre
Moutou Claire
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