On the proper Mach number and ratio of specific heats for modeling the Venus bow shock

Details On the proper Mach number and ratio of specific heats for modeling the Venus bow shock On the proper Mach number and ratio of specific heats for modeling the Venus bow shock

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.7381t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Sept. 1, 1984, p. 7381-7392.

Physics

36

Mach Number, Magnetohydrodynamics, Solar Planetary Interactions, Space Plasmas, Venus Atmosphere, Atmospheric Models, Bow Waves, Gas Dynamics, Pioneer Venus 1 Spacecraft, Rankine-Hugoniot Relation, Shock Wave Propagation, Specific Heat, Venus, Bowshock, Models, Specific Heat, Plasmas, Magnetohydrodynamics, Shock, Magnetic Fields, Shape, Solar Wind, Interactions

Scientific paper

Observational data from the Pioneer Venus Orbiter are used to investigate the physical characteristics of the Venus bow shock, and to explore some general issues in the numerical simulation of collisionless shocks. It is found that since equations from gas-dynamic (GD) models of the Venus shock cannot in general replace MHD equations, it is not immediately obvious what the optimum way is to describe the desired MHD situation with a GD code. Test case analysis shows that for quasi-perpendicular shocks it is safest to use the magnetospheric Mach number as an input to the GD code. It is also shown that when comparing GD predicted temperatures with MHD predicted temperatures total energy should be compared since the magnetic energy density provides a significant fraction of the internal energy of the MHD fluid for typical solar wind parameters. Some conclusions are also offered on the properties of the terrestrial shock.

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