Numerical simulations of magnetic field induction in the tidally driven oceans of Europa and Titan (Invited)

Details Numerical simulations of magnetic field induction in the tidally driven oceans of Europa and Titan (Invited) Numerical simulations of magnetic field induction in the tidally driven oceans of Europa and Titan (Invited)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p44a..03g&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P44A-03

Physics

[5430] Planetary Sciences: Solid Surface Planets / Interiors, [5440] Planetary Sciences: Solid Surface Planets / Magnetic Fields And Magnetism, [5450] Planetary Sciences: Solid Surface Planets / Orbital And Rotational Dynamics

Scientific paper

A global ocean beneath the ice shell of Europa has been inferred from the induced magnetic field measured during Galileo flybys (Kivelson et al). The main part of this induced field is an equatorial dipole that attempts to cancel the part of Jupiter's magnetic field at Europa that is time varying due to the rotation of Jupiter's tilted dipole. Previous studies have neglected the additional induction due to the circulation of the ocean. We simulate this 3D global circulation driven by a tidal potential and the small-scale time-dependent magnetic field it induces in addition to the more intense equatorial dipole. Magnetic induction due to ocean flows is relatively more significant for Titan because Saturn's field at Titan is nearly constant in time. The significance of this approach is that the spatial and temporal frequencies of the fields induced by the ocean flows differ from those induced by the mean "solid body" ocean in the giant planet's rotating dipolar field. If the former can be detected by an orbiting spacecraft we may be able to learn much more about the dynamics of both the ocean and the ice shell. Preliminary results from these simulation studies will be presented.

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