On determining magnetohydrodynamic shock parameters theta sub Bn and M sub A

Details On determining magnetohydrodynamic shock parameters theta sub Bn and M sub A On determining magnetohydrodynamic shock parameters theta sub Bn and M sub A

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..641c&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 32, May 1984, p. 641-646.

Physics

25

Collisionless Plasmas, Mach Number, Magnetic Fields, Magnetohydrodynamic Waves, Shock Waves, Errors, Plasma Density, Plasma Turbulence, Wave Equations

Scientific paper

In a collisionless plasma, the magnetohydrodynamic shock structure, the associated waves and turbulence depend strongly on the shock parameters theta sub Bn and M sub A, where theta sub Bn is the angle between the upstream magnetic field and the shock normal and M sub A is the upstream Alfven Mach-number. A method is given to determine theta sub Bn and M sub A and their estimated errors for all types of shocks without knowing the shock normals. The only measured quantities needed to determine theta sub Bn and M sub A are the plasma density and magnetic field on both sides of the shock. The estimted error of theta sub Bn using this method can be obtained in a straightforward manner and is more reliable than that based on the calculated shock normal and the upstream magnetic field. Its simplicity and ability to handle parallel shocks as well as perpendicular and oblique shocks are illustrated by examples. This method should be useful for characterizing the types of shocks from analyzing the copious amount of data on magnetohydrodynamic (MHD) shocks found in space.

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