Physics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..381b&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 13, April 1986, p. 381-384. NASA-DOE-supported research.
Physics
18
Astronomical Models, Comet Tails, Computerized Simulation, Giacobini-Zinner Comet, Chemical Composition, Cometary Atmospheres, Plasma Interactions, Solar Wind, Space Plasmas, Comets, Giacobini-Zinner, Models, Computer Methods, Parameters, Comae, Comet Tails, Comet Nuclei, Size, Composition, Comparisions, Electrons, Spacecraft Observations, Ice Mission, Hydrodynamics, Chemistry, Kinetics
Scientific paper
A computer model of Comet P/Giacobini-Zinner is presented which contains photoprocesses, gas-phase chemical kinetics, energy balance, multifluid hydrodynamics with a transition to free molecular flow, and solar wind interaction. Recently the physics for electrons in the model has been improved by including electron impact ionization and dissociation and separately accounting for electron energetics. Electron heating and cooling mechanisms include photoprocesses, recombination processes, inelastic and elastic collisions with heavy molecules, and expansion cooling. The model incorporates an internally consistent interaction of the solar wind with the coma gas using the axisymmetric ideal fluid dynamic equations. The nuclear size and composition have been chosen to make the calculations relevant to the September 11, 1985 International Cometary Explorer (ICE) encounter with Comet P/Giacobini-Zinner. Model profiles of the temperature, velocity, and number density of the electrons are in good agreement with measurements along ICE's trajectory. The results indicate the probe passed through a region of the coma at the onset of the plasma tail.
Boice Daniel C.
Huebner Walter F.
Keady John Joseph
Schmidt Hans-Ulrich
Wegmann Rudolf
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