Statistics – Computation
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391..336c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 1, May 20, 1992, p. 336-352.
Statistics
Computation
7
Comet Nuclei, Cometary Atmospheres, Condensing, Photochemical Reactions, Water Vapor, Chemical Composition, Computational Chemistry, Halley'S Comet, Hydrodynamic Equations, Interstellar Chemistry, Mesopause
Scientific paper
A chemical model applicable to the circumnuclear region of water-dominated active comets is presented. The model self-consistently considers the vacuum outflow of coma gas and dust, the development of gas-phase photochemical reactions, and the formation of neutral and positively charged water clusters. Solutions are presented using simple boundary conditions consistent with P/Halley in situ gathered data. The results illustrate the strong propensity of such a medium toward partial recondensation, either by homogeneus or by ion-induced clustering. In particular, the dominance of heavy proton hydrates in the innermost coma positive charge density is predicted. The results are compared to similar effects observed in a closely related natural medium: the terrestrial mesopause region. Their limits are carefully outlined, and directions for future developments are indicated.
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