A kinetic model for gas effusion in comet atmospheres

Details A kinetic model for gas effusion in comet atmospheres A kinetic model for gas effusion in comet atmospheres

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....13858l&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #13858

Physics

Scientific paper

We are developing a new deterministic model for the effusion of molecular gases from a porous comet surface into the transition region (Knudsen Layer) of the atmosphere. The model is based on the direct solution of the multistream Boltzmann transport equation, and is significantly faster than Monte Carlo methods. In the first year of this work, we developed a numerical solution of the transport equation relevant to comets, and examined the transport behavior of H2O effusing from beneath the comet surface into the coma, including fluxes returning to the surface. The model conserves energy to better than 1%. We are now in the process of adding inelastic collisions and dust interactions to the model. The model is being developed in anticipation of measurements of molecular microwave lineshapes to be made by the MIRO instrument on the upcoming Rosetta mission.

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