HR: 0800h
AN: P21B-0548    [Abstracts]
TI: Using 3D MHD Simulations to Improve the Internal Magnetic Field Model of Ganymede
AU: * JIA, X
EM: xzjia@igpp.ucla.edu
AF: Institute of Geophysics and Planetary Physics, Universityo of California Los Angeles, 405 Hilgard Ave., Los Angeles, CA 90095-1567, United States
AU: * JIA, X
EM: xzjia@igpp.ucla.edu
AF: Department of Earth and Space Sciences, Universityo of California Los Angeles, 405 Hilgard Ave., Los Angeles, CA 90095-1567, United States
AU: Walker, R J
EM: rwalker@igpp.ucla.edu
AF: Institute of Geophysics and Planetary Physics, Universityo of California Los Angeles, 405 Hilgard Ave., Los Angeles, CA 90095-1567, United States
AU: Walker, R J
EM: rwalker@igpp.ucla.edu
AF: Department of Earth and Space Sciences, Universityo of California Los Angeles, 405 Hilgard Ave., Los Angeles, CA 90095-1567, United States
AU: Kivelson, M G
EM: mkivelso@igpp.ucla.edu
AF: Institute of Geophysics and Planetary Physics, Universityo of California Los Angeles, 405 Hilgard Ave., Los Angeles, CA 90095-1567, United States
AU: Kivelson, M G
EM: mkivelso@igpp.ucla.edu
AF: Department of Earth and Space Sciences, Universityo of California Los Angeles, 405 Hilgard Ave., Los Angeles, CA 90095-1567, United States
AU: Khurana, K K
EM: kkhurana@igpp.ucla.edu
AF: Institute of Geophysics and Planetary Physics, Universityo of California Los Angeles, 405 Hilgard Ave., Los Angeles, CA 90095-1567, United States
AU: Linker, J A
EM: linkerj@saic.com
AF: Science Applications International Corporation, 10260 Campus Point Drive, San Diego, CA 92121, United States
AB: 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.
DE: 2753 Numerical modeling
DE: 6030 Magnetic fields and magnetism
DE: 6033 Magnetospheres (2756)
DE: 6218 Jovian satellites
DE: 6222 Ganymede
SC: Planetary Sciences [P]
MN: 2007 Fall Meeting