Other
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..834h&link_type=abstract
European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a
Other
Scientific paper
The ISSI comet Modeling Team is working to generate a versatile suite of comet environmentmodels for both weak and active comets. One of the primary goals of the team is to generate a set of comprehensive models of the cometary coma ranging from the surface out to the interaction with the solar wind and covering dust, gas and plasma phases. Our initial target comet is 67P/Churyumov-Gerasimenko, the target of the Rosettamission. Suchmodels are necessary for planningmission operations and data interpretation. The environmental models will be validated (to the extent possible) with remote observations of the target comet and of other comets as well as with in-situ observations from previous comet missions. This will give us more confidence in the engineering environmental models for the new Rosetta target comet. The team has linked together a series of 3D models for the nucleus, neutral gas, plasma, and dust. The model suite includes a thermophysical model of the upper layers of the porous nucleus surface, the Knudsen layer at the boundary with the coma, a Direct Simulation Monte Carlo dustygas kinetic model for the neutral dust and gas coma, both magnetohydrodynamic and hybrid-kinetic models for the solar wind cometary plasma interaction, a two-stream thermal and superthermal electron model and a charged dust model. Information from each model is propagated into the others providing a full description of the environment from the surface out to millions of km. The fully 3D coupled model suite has revealed a number of new insights into the cometary environment. For example, the non-spherical nature of dust and gas flow from the nucleus produces a decidedly non-radial flow in the very inner coma. Other sample results from the model suite will be shown. To access the results of our simulations we are creating a tool which will provide the community with easy access to simulation results. The Inner Coma Environment Simulation tool (ICES) has been developed as part of the efforts of our ISSI comet modeling team. We will present results fromeach of the physicalmodels which are currently being developed and will also demonstrate the ICES tool.
Gombosi Tamas I.
Hansen Kenneth Calvin
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