Modeled Neutral Densities of Comet 1P/Halley: a Comparison With Giotto's Neutral Mass Spectrometer

Details Modeled Neutral Densities of Comet 1P/Halley: a Comparison With Giotto's Neutral Mass Spectrometer Modeled Neutral Densities of Comet 1P/Halley: a Comparison With Giotto's Neutral Mass Spectrometer

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p51c1420r&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #P51C-1420

Astronomy and Astrophysics

Astrophysics

6008 Composition (1060), 6025 Interactions With Solar Wind Plasma And Fields

Scientific paper

The neutral gas environment of a comet is largely influenced by dissociation of parent molecules created at the surface of the comet and collisions of all the involved species. To better our understanding of this environment, we compare the results from a kinetic model of the neutral cometary environment with data from the Neutral Mass Spectrometer (NMS) collected during Giotto's fly-by at comet 1P/Halley in 1986. The model solves the Boltzmann equation with a Direct Simulation Monte Carlo (DSMC) technique [Tenishev et al. (in press, Astrophys. J.)] by tracking trajectories of gas molecules and icy grains under the influence of the comet's weak gravity field with momentum exchange among particles modeled in a probabilistic manner. The cometary nucleus and sublimating icy grains are considered to be the source of parent species (H2O, CO, H2CO and CO2) in the coma. The densities of parent species and the corresponding dissociation products (H, H2, C, O, OH, CH, CH2) are compared to the measurements acquired by NMS along the Giotto trajectory from 40~000~km to roughly 1000~km at closest approach.

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