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| Titel |
Models for Callisto's Plasma Interaction: Implications for the satellite's Atmosphere and Interior |
| VerfasserIn |
M. Seufert, J. Saur |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250067794
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| Zusammenfassung |
| We present results from a MHD-model for the sub-Alfvénic interaction of Callisto with the
surrounding magnetospheric plasma taking into account the influence of Callisto’s neutral
CO2 and O2 atmosphere on the plasma flow and magnetic fields induced in a possible
subsurface liquid water ocean. The existence of a subsurface ocean was proposed e.g.
by Neubauer [1998], Kivelson et al. [1999] and Zimmer et al. [2000] based on
magnetometer data analysis. However, none of these previous studies included detailed
modeling of Callisto’s plasma interaction. We present the first 3D-MHD-models
for the plasma interaction considering several flybys of Galileo at Callisto. We
compare the magnetic signatures predicted by the plasma interaction model including
an induced interior dipole with Galileo magnetometer data. We further use our
models to investigate the structure of Callisto’s atmosphere-ionosphere system for
two cases: Static plasma conditions (v0 = 0) with an ionosphere in chemical and
radiative equilibrium and for the corresponding dynamic plasma flow conditions.
The ionospheric structure is then compared to radio occultation measurements by
Kliore et al. [2002]. The final goal of this study is to deduce information about
possible temporal variations and the overall structure of Callisto’s atmosphere and
ionosphere and eventually about the interior ocean layer from the magnetic field
data. |
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