Title:
The flow of the subliming gas in the near-nuclear (Knudsen) layer of the cometary coma
Authors:
Bisikalo, D. V.; Marov, M. Ya.; Shematovich, V. I.; Strel'Nitskij, V. S.
Affiliation:
AC(AN SSSR, Astronomicheskii Sovet, Moscow, USSR) AD(AN SSSR, Institut Prikladnoi Matematiki, Moscow, USSR)
Journal:
(COSPAR, IAGA, and IAU, Plenary Meeting, 27th, Symposium, Workshop, and Topical Meeting on Cometary Environments, Espoo, Finland, July 18-29, 1988) Advances in Space Research (ISSN 0273-1177), vol. 9, no. 3, 1989, p. 53-58. (AdSpR Homepage)
Publication Date:
00/1989
Category:
Astrophysics; Comets
Origin:
STI; LPI [AN-891206%J]
NASA/STI Keywords:
COMA, COMET NUCLEI, COMETARY ATMOSPHERES, SUBLIMATION, GAS DYNAMICS, GAS FLOW, KNUDSEN FLOW, SURFACE TEMPERATURE
LPI Keywords:
COMETS, COMAE, SUBLIMATION, GASES, FLOW, NUMERICAL METHODS, SIMULATIONS, BOUNDARIES, DYNAMICS, TEMPERATURE, CALCULATIONS, PARAMETERS, WATER VAPOR, MONTE CARLO METHODS, SURFACE, KINETICS, ICE
Bibliographic Code:
1989AdSpR...9...53B

Abstract

The process of sublimation from comet nuclei is examined using the Monte Carlo method of direct statistical simulation, focusing on the near-nuclear (Knudsen) layer in the outgoing flow forming the cometary atmosphere. A Boltsmann-type equation is presented to describe the nonequilibrium outflow of comet gas in the Knudsen layer. The equation defines the boundary conditions for the nearly gas-dynamical flow formed several mean free patches away from the surface of the nucleus. The reactive force acting upon the surface unit is determined and the problem of temperature discontinuity at the sublimating surface is discussed.