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| Titel |
Hybrid Plasma Simulation Studies of Coma Anisotropies |
| VerfasserIn |
N. Gortsas, U. Motschmann, E. Kührt |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250024774
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| Zusammenfassung |
| We present hybrid plasma simulations at comets with an anisotropic activity pattern. The investigation demonstrates the modification of the global plasma environment of a weak comet due to anisotropies in its coma. From Earth-based observations as well as from in-situ spacecraft measurements the coma of many comets is ascertained to be anisotropic. However, most plasma simulation studies deploy a spherically symmetric activity pattern. In this paper anisotropy is studied by considering three different coma shape models. These shape models feed a fully 3-D hybrid plasma model which treats electrons as a massless, charge-neutralizing fluid, whereas ion dynamics are covered by a kinetic approach. The simulations have been carried out for the Rosetta target comet 67P/Churyumov-Gerasimenko. Two heliocentric distances covering two distinct different states of nucleus activity and the solar wind plasma are considered. |
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