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Title:
Rosetta-ISSI Comet 67P/Churyumov-Gerasimenko Environment Model
Authors:
Hansen, K. C.; Alexander, C. J.; Altwegg, K.; Bagdonat, T.; Bertini, I.; Coates, A. J.; Combi, M. R.; Cravens, T. E.; Davidsson, B. J. R.; Geiss, J.; Gombosi, T. I.; Horanyi, M.; Jia, Y.-D.; Motschmann, U.; Rickman, H.; Robertson, I. P.; Schwehm, G.; Tenishev, V.; Thomas, N.
Affiliation:
AA(University of Michigan), AB(JPL), AC(University of Bern), AD(TU Branschweig), AE(University of Bern), AF(MSSL), AG(University of Michigan), AH(University of Kansas), AI(Uppsala University), AJ(University of Bern), AK(University of Michigan), AL(University of Colorado), AM(University of Michigan), AN(TU Branschweig), AO(Uppsala University), AP(University of Kansas), AQ(ESA/ESTEC), AR(University of Michigan), AS(University of Bern)
Publication:
American Astronomical Society, DPS meeting #37, #16.08; Bulletin of the American Astronomical Society, Vol. 37, p.646
Publication Date:
08/2005
Origin:
AAS
Bibliographic Code:
2005DPS....37.1608H

Abstract

The main goal of the ISSI (International Space Science Institute) Comet Modeling Team is to improve our understanding of the emission of gas and dust in the comet's coma from the nucleus, the comet solar wind interaction, cometary ion chemistry, and cometary high-energy processes through the combination of state-of-the-art modeling and analysis of observations of the cometary environment. The understanding of comets and cometary processes gained from the ongoing modeling studies will be important preparatory work for future comet missions in general, and the Rosetta mission to comet 67P/Churyumov-Gerasimenko in particular.

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 dusty-gas 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.

The International Space Science Institute and NASA provided partial support for this work.

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