Distribution of gas in the inner comae of comets

Details Distribution of gas in the inner comae of comets Distribution of gas in the inner comae of comets

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990muaa.reptr....c&link_type=abstract

Final Report, Nov. 1989 - Oct. 1990 Michigan Univ., Ann Arbor. Space Physics Research Lab.

Physics

Space Physics

Atmospheric Chemistry, Cometary Atmospheres, Comets, Interplanetary Gas, Mathematical Models, Molecular Flow, Monte Carlo Method, Spatial Distribution, Amino Radical, Carbon, Coma, Cyanogen, Free Molecular Flow, Halley'S Comet, Molecular Spectra, Neutral Gases, Oxygen, Transition Flow

Scientific paper

In order to understand the physical and chemical processes which produce the observed spatial morphology of the cometary coma, it is necessary to analyze observational data with physically meaningful models. Thus, a coupled program of theoretical modeling and complementary observational data analysis was undertaken regarding the spatial distributions of neutral gases in the coma. More, specifically, the particular topics of interest are: (1) the theoretical modeling of the nonequilibrium dynamics of the inner coma with emphasis on the region of the coma from the transition from collisional fluid flow out to the free-flow region and on observable conditions in the coma (i.e., density, outflow speed, and temperature); and (2) the model analysis of an important set of long-slit CCD spectra of comets. The side-by-side development of models along with the observation and analysis of data is an important and integral part of this project. The scientific community has in hand valuable observational and in situ data regarding one comet, Halley. It is important to use Halley as the benchmark by which other remotely observed comet data can be understood. Therefore, the self-consistant analysis of data with appropriate models is of the utmost importance. The data analysis work includes the analysis of the spatial profiles of (OI), NH2, CN, and C2.

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