The atmosphere of a dirty-clathrate cometary nucleus - A two-phase, multifluid model

Details The atmosphere of a dirty-clathrate cometary nucleus - A two-phase, multifluid model The atmosphere of a dirty-clathrate cometary nucleus - A two-phase, multifluid model

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...273..381m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 273, Oct. 1, 1983, p. 381-396.

Astronomy and Astrophysics

Astrophysics

57

Atmospheric Models, Clathrates, Comet Nuclei, Cometary Atmospheres, Cosmic Dust, Electron Energy, Photochemical Reactions, Radiative Transfer, Transonic Flow, Two Phase Flow, Comets, Comet Nuceli, Atmosphere, Models, Phases, Clathrate, Dust, Gases, Dynamics, Thermal Properties, Structure, Fluids, Comparisons, Electrons, Ions, Collisions, Energy, Water, Electrical Properties, Conductivity, Plasma, Flow, Shock, Calculations, Radiation

Scientific paper

The dynamical and thermal structure of a dirty-clathrate cometary nucleus' gas atmosphere is presently given a self-consistent, transonic multifluid solution in which, although the heavy neutron and ion species are treated as a single fluid in the collision-dominated region, the photoproduced H is treated separately. The thermal profile of the atmosphere thus obtained is entirely different from those predicted by the earlier, single-fluid models as well as the multifluid models which assumed equipartition of energy between electrons and ions. While the electron gas, like the neutrals and the ions, cools due to expansion, its main mode of energy loss in the inner coma is by way of inelastic collisions with the predominant H2O molecule. The high electron temperature in the outer coma also decreases the efficiency of electron removal by dissociative recombination, thereby increasing electron density throughout the coma.

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