Numerical modeling of the nonequilibrium flow of a rarefied gas in the inner coma of a comet

Details Numerical modeling of the nonequilibrium flow of a rarefied gas in the inner coma of a comet Numerical modeling of the nonequilibrium flow of a rarefied gas in the inner coma of a comet

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988avest..22...41b&link_type=abstract

Astronomicheskii Vestnik (ISSN 0320-930X), vol. 22, Jan.-Mar. 1988, p. 41-48. In Russian.

Astronomy and Astrophysics

Astronomy

Comet Heads, Nonequilibrium Flow, Rarefied Gas Dynamics, Halley'S Comet, Hydrogen, Hydroxyl Radicals, Nonequilibrium Thermodynamics, Water Vapor

Scientific paper

The velocity distribution functions of gas components of the inner cometary coma consisting of H2O vapour and products of its photolysis are calculated for a comet of medium gas production rate (like the Halley comet) at the heliocentric distance of 1 a.u. A modification of the direct Monte-Carlo simulation method is used. With the calculated distribution functions the radial profiles of macroparameters of H2O, OH, H are obtained for the spherically-symmetric outflow. It is shown that the breakdown of the local thermal equilibrium for the gas of parent molecules (H2O) begins very close (r ⪆ 7 km) to the nucleus.

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