Using 3D MHD Simulations to Improve the Internal Magnetic Field Model of Ganymede

Details Using 3D MHD Simulations to Improve the Internal Magnetic Field Model of Ganymede Using 3D MHD Simulations to Improve the Internal Magnetic Field Model of Ganymede

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p21b0548j&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P21B-0548

Physics

2753 Numerical Modeling, 6030 Magnetic Fields And Magnetism, 6033 Magnetospheres (2756), 6218 Jovian Satellites, 6222 Ganymede

Scientific paper

Ganymede, the biggest moon in the solar system, has an intrinsic magnetic field. The internal field is strong enough to form a mini magnetosphere, embedded within Jupiter's giant magnetosphere, that interacts with the corotating Jovian plasma. We have conducted a series of three dimensional MHD simulations to understand the magnetic configuration of Ganymede's magnetosphere using several field and particle data sets from Galileo as boundary conditions. In general, the magnetic field configuration resolved in the MHD simulation has shown satisfying agreement with the Galileo observations for all six close encounters. The magnetopause currents are well resolved in our high resolution simulations, producing sharp rotations in the field orientation consistent with the observations. In these simulations, we have used the internal field model from Kivelson et al. [2002] in which Ganymede's internal dipole field was fitted by using observations from three out of the six close encounters under the assumption that the magnetopause currents contributed a constant magnetic field. We will use the more accurate description of field perturbations of the external currents extracted from our MHD simulations to refine Ganymede's internal field model and to assess the inductive response.

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