Multiple spacecraft observations of interplanetary shocks ISEE three-dimensional plasma measurements

Details Multiple spacecraft observations of interplanetary shocks ISEE three-dimensional plasma measurements Multiple spacecraft observations of interplanetary shocks ISEE three-dimensional plasma measurements

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.9941r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Dec. 1, 1983, p. 9941-9947. Research sponsored by the U.S. Department

Mathematics

38

Interplanetary Magnetic Fields, Magnetic Measurement, Satellite Observation, Shock Wave Propagation, Solar Wind, International Sun Earth Explorer 1, International Sun Earth Explorer 3, Propagation Modes, Propagation Velocity, Rankine-Hugoniot Relation, Vectors (Mathematics)

Scientific paper

ISEE 1 and ISEE 3 three-dimensional solar wind plasma measurements are used together with magnetic field measurements across five previously studied interplanetary shocks to test the accuracy of the mixed-mode shock-normal determination technique and to test whether the shock properties are best approximated with a ratio of specific heats of 5/3 or 2. In the shocks examined, the assumption that the velocity jump was along the normal provided an estimate of the shock normal within 15 deg of the best fit normal 50 percent of the time and within 50 deg, 90 percent of the time. The mixed-mode normals lay within 12 deg of the best fit normal 50 percent of the time and within 36 deg, 90 percent of the time. Part of this deviation may be due to differences in the orientation of the local normal from that of the average normal. Finally, the jump in plasma and field across the shock is better predicted from the Rankine-Hugoniot equations using a ratio of specific heats of 5/3 rather than 2.

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