On the assumptions commonly made for the evaluation of the compression, speed, normal orientation of a collisionless magnetohydrodynamic (MHD) shock, and their limitations

Details On the assumptions commonly made for the evaluation of the compression, speed, normal orientation of a collisionless magnetohydrodynamic (MHD) shock, and their limitations On the assumptions commonly made for the evaluation of the compression, speed, normal orientation of a collisionless magnetohydrodynamic (MHD) shock, and their limitations

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh33a1187b&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH33A-1187

Statistics

Computation

7811 Discontinuities, 2116 Energetic Particles, Planetary, 2134 Interplanetary Magnetic Fields, 2139 Interplanetary Shocks, 2149 Mhd Waves And Turbulence

Scientific paper

The magnetohydrodynamic Rankine-Hugoniot conditions for a shock are reviewed. The requirements for the computation of the fast forward interplanetary shock parameters and their uncertainties are presented. The underlying assumptions used in the evaluation of the shock parameters are discussed. The applied technique is a combination of the "pre-averaged" magnetic-coplanarity, velocity-coplanarity, and the Abraham-Schrauner-mixed methods (1). It is shown that within acceptable limits this technique generally gave good results, with some exceptions. Arguments are presented that a nearby-located MHD discontinuity would cause the failure of the applied technique. Examples of that situation are presented. In these cases the shock normal is identified with the help of data from multiple spacecraft located within hundreds of earth radii distance from each other. Here the assumption is that within hundreds of earth radii distances the shock curvature is negligible. (This assumption appears to be valid for locally-driven transient shocks.) (1) Berdichevsky et al., J. Geophys. Res., 105, 27,289-27,314, 2000; Errata in J. Geophys. Res., 106, 25,133, 2001

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