Computer Science
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3084..235c&link_type=abstract
In its The Interstellar Medium in External Galaxies: Summaries of Contributed Papers p 235-237 (SEE N91-14100 05-90)
Computer Science
Cosmic Rays, Dissociation, Gas Dissociation, Hydrogen, Interstellar Matter, Ionization, Ionized Gases, Magnetic Fields, Magnetohydrodynamic Waves, Magnetohydrodynamics, Molecular Gases, Cooling, Gas Density, Low Speed, Molecules, Sensitivity, Surveys, Vibration
Scientific paper
Researchers survey shock solutions of a partially ionized gas with a magnetic field. The gas is modeled by interacting neutral, ion, electron and charged grain components. They employ a small neutral-ion chemical network to follow the dissociation and ionization of the major species. Cooling by molecular hydrogen (rotational, vibrational and dissociation), grains and dipole molecules is included. There are three basic types of solutions (C, C asterisk, and J) and some more complicated flows involving combinations of the basic types. The initial preshock conditions cover hydrogen nuclei densities of 1 less than n less than 1010 cm(-3) and shock velocities of 5 less than vs less than 60 km/s. The magnetic field is varied over 5 decades and the sensitivity of the results to grain parameters, UV and cosmic ray fluxes is ascertained. The parameter space is quite complicated, but there exist some simple divisions. When the initial ionization fraction is small (chii less than 10(-5)), there is a sharp transition between fully C solutions at low velocity and strong J solutions at high velocity. When the initial ionization fraction is larger, C asterisk and/or very weak J shocks are present at low velocities in addition to the C solutions. The flow again changes to strong J shocks at high velocities. When the ionization fraction is large and the flow is only slightly greater than the bulk Alfven velocity, there is a complicated mixture of C, C asterisk and J solutions.
Chernoff David F.
Hollenbach David J.
McKee Christopher F.
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