Simulations of high Mach number perpendicular shocks with resistive electrons

Details Simulations of high Mach number perpendicular shocks with resistive electrons Simulations of high Mach number perpendicular shocks with resistive electrons

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.8805q&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Aug. 1, 1986, p. 8805-8815. NASA-DOE-supported research.

Physics

66

Bow Waves, Computerized Simulation, Earth Environment, Electron Plasma, Mach Number, Magnetohydrodynamic Waves, Collisionless Plasmas, Diffusion Length, Mach Reflection, Magnetic Fields, Plasma Pressure, Shock Waves

Scientific paper

A simulation code which models the ions as microparticles and the electrons as a resistive massless fluid is employed to study the structure of high Mach number perpendicular shocks. It is found that stable stationary shock solutions can be obtained for Alfven Mach numbers (M sub A) between 5 and 60 for upstream plasmas where the ratio of the plasma pressure to the magnetic pressure is 1, providing that the upstream resistive diffusion length is much smaller than the ion inertial length. For much larger resistive diffusion lengths, the magnetic field overshoot is damped, and the imbalance in the electron momentum equation results in a periodic fluctuation of the fraction of reflected ions. In the limit of M sub A of less than 10, the magnetic overshoot and the fraction of reflected ions increase with increasing M sub A, while at higher Mach numbers the fraction of reflected ions peaks at about 40 percent and the magnetic field overshoot increases at a much slower rate. Electron inertial effects are also considered.

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