Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phdt.........3m&link_type=abstract
Ph.D. Thesis California Univ., San Diego.
Physics
Cometary Atmospheres, Hydrodynamics, Ultraviolet Radiation, Water, Cooling, Fluid Flow, Hydrogen, Radiative Transfer, Supersonic Flow
Scientific paper
A sequence of hydrodynamic models of the region of the cometary atmosphere bounded by the comet surface and the inner shock is developed. In each case, assuming spherical symmetry and steady state flow, the hydrodynamic equations of continuity, momentum, and energy are solved self-consistently for a varying number of fluids and phases with the equations of radiative transfer in a number of wavelength intervals for a multi-species atmosphere. In the first model a dust-free-fluid atmosphere with UV radiative transfer in three intervals is obtained for a pure H2O nucleus. It is seen that the combination of strong IR and expansion cooling dominate the flow in the inner coma, generating a strong temperature inversion and highly supersonic flow. In the outer coma UV heating dominates, driving the temperature up to approx. 800 K. The model is extended by including the effets of dust and treating the hydrogen as a separate fluid/quasi-fluid mixture. Finally, in the last model the H2O is replaced by a clathrate mixture of H2O, CO2, and N2 and the electrons treated as a separate fluid.
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