A Global Two-Species MHD Model of the Cometary Plasma Environment

Details A Global Two-Species MHD Model of the Cometary Plasma Environment A Global Two-Species MHD Model of the Cometary Plasma Environment

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.2910j&link_type=abstract

American Astronomical Society, DPS meeting #38, #29.10; Bulletin of the American Astronomical Society, Vol. 38, p.536

Astronomy and Astrophysics

Astronomy

Scientific paper

Plasma ions are divided into solar wind proton and heavy cometary ion species in our new global magnetohydrodynamic (MHD) model for the interaction of the cometary ionosphere with the solar wind. Cometary neutrals serve as the source for ionization and charge exchange processes. The model accounts for heavy ion ionization, heavy-proton and heavy-heavy charge-exchange, and heavy and proton recombination. With this model, two kinds of comets are studied: a bright Halley- class comet and a weaker Jupiter family comet. For the Halley- class comet, a generalized spherical neutral production rate is used to simulate the neutral density. For the Jupiter family comet, an axisymmetric neutral density about the comet-sun line as well as its velocity profile, derived from a gas-kinetic model for the Rosetta target comet 67P/ Churyumov- Gerasimenko are used. For the first time, the global distribution of averaged ion mass throughout the comet-solar wind interaction region are provided by a self-consistent MHD model. In addition, our model with two ion species also provides the number density distribution of solar wind protons and comet water ion species, which is more comparable to the ground-based images of water and CO+ ions.

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