Mathematics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...61..278k&link_type=abstract
Icarus (ISSN 0019-1035), vol. 61, Feb. 1985, p. 278-295.
Mathematics
10
Cometary Atmospheres, Computerized Simulation, Hydrogen Atoms, Monte Carlo Method, Photodissociation, Reaction Kinetics, Atomic Spectra, Density Distribution, Hydroxyl Radicals, Line Shape, Mathematical Models, Molecular Collisions, Thermalization (Energy Absorption), Two Dimensional Models, Velocity Distribution, Water Vapor, Comets, Comae, Models, Hydrogen, Monte Carlo Method, Ejection, Water, Photodissociation, Thermal Effects, Collisions, Radiation, Pressure, Spectra, Velocity, Distribution, Density, Ca
Scientific paper
A two-dimensional theoretical model for the hydrogen coma of a comet, based on the Monte Carlo method, is presented. The model incorporates thermalization of H atoms through collisions with ambient H2O molecules, isotropic ejections of H atoms produced by photodissociations of H2O and OH, and the effect of solar-radiation pressure. The production spectrum of H atoms from OH photodissociation is evaluated and it is found that the spectrum is sharply peaked at the central value (8 km/sec) which is characterized by a standard deviation of 0.1 km/sec. The velocity distribution functions of the H atoms and the profiles of their outflow velocities and densities are calculated. It is shown that for small heliocentric distances, the H atoms thermalized by collisions in the inner coma play an important role in determining the density profiles and the velocity distributions and that thermalized H atoms lead to an increase in the density in the inner coma. On the basis of the velocity distribution functions, Lyman-alpha isophotes and their spectral line profiles are calculated in an optically thin approximation.
Ashihara Osamu
Kitamura Yoshimi
Yamamoto Tadahiro
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