Structure of the quasi-parallel bow shock - Results of numerical simulations

Details Structure of the quasi-parallel bow shock - Results of numerical simulations Structure of the quasi-parallel bow shock - Results of numerical simulations

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.6919k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Sept. 1, 1983, p. 6919-6925.

Physics

45

Bow Waves, Computerized Simulation, Shock Wave Profiles, Whistlers, Earth Magnetosphere, Ion Temperature, Magnetosonic Resonance, Polarization Characteristics, Rankine-Hugoniot Relation

Scientific paper

A one-dimensional, nonperiodic hybrid code in which ion dynamics are treated exactly, while those of electrons are omitted by neglecting electron inertia and pressure, is employed in the simulation of quasi-parallel bow shock structures. It is found that for an Alfven Mach number smaller than 3, the magnetic field profile of the shock is laminar or quasi-laminar, and that the upstream waves are right-hand polarized whistlers. Downstream waves are absent or low in amplitudes. For Alfven Mach numbers greater than 3, the magnetic field profile of the shock is turbulent, and the upstream waves are again right-hand polarized whistlers. The transition from laminar-subcritical to turbulent-supercritical shock structures is shown to be due to the firehose instability which occurs at Alfven Mach numbers greater than about 3.

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