3D MHD Models for Callisto's Plasma and Magnetic Field Environment

Details 3D MHD Models for Callisto's Plasma and Magnetic Field Environment 3D MHD Models for Callisto's Plasma and Magnetic Field Environment

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm21b2011s&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM21B-2011

Physics

Geophysics

[0925] Exploration Geophysics / Magnetic And Electrical Methods, [2732] Magnetospheric Physics / Magnetosphere Interactions With Satellites And Rings, [6223] Planetary Sciences: Solar System Objects / Callisto

Scientific paper

We present 3D MHD models for the sub-Alfvénic interaction of Callisto with the surrounding magnetospheric plasma taking into account magnetic fields induced in a possible subsurface liquid water ocean and compare the results to magnetometer data for several flybys of the Galileo spacecraft. Modeling of the plasma interaction signals at Callisto is necessary in order to infer the contribution of induced magnetic fields to the perturbation signals measured in the vicinity of the satellite. These interaction signals are caused by currents flowing in Callisto's ionosphere and along Alfvén wings closing in the Jovian ionosphere. We present MHD models for the plasma interaction for several flybys of Galileo at Callisto using initial plasma parameters measured by the spacecraft. In these models the configurations of Callisto's atmosphere and ionosphere control the strength of the subalfvénic interaction with the ambient plasma. By adjusting the model parameters to match the observed magnetic fields it is therefore possible to infer information about the Callisto's atmospheric system. Additionally, by subtracting the modeled interaction fields from the magnetometer data it is possible to constrain the contributions of induced magnetic fields to the total signal. We discuss what information about the configuration of Callisto's interior structure can be deduced from the residual induced magnetic fields.

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