Elliptical instability in terrestrial planets and moons

Details Elliptical instability in terrestrial planets and moons Elliptical instability in terrestrial planets and moons

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1104c&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1104

Physics

Scientific paper

Any planet may be subject to three kinds of harmonic mechanical forcing, driven respectively by libration, precession and tides. These forcings can generate flows in internal fluid layers such as fluid cores and subsurface oceans, whose dynamics then significantly differ from solid body rotation. In particular, tides and librations are known to be capable of exciting the so-called elliptical instability, corresponding to the destabilization of two-dimensional flows with elliptical streamlines, leading to three-dimensional turbulence. The presence of such an elliptical instability driven by tides and librations is investigated in terrestrial bodies. Its consequences on energy dissipation, on magnetic field induction and on heat flux fluctuations at the planetary scale are considered.

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