Magnetic field change across the earth's bow shock Comparison between observations and theory

Details Magnetic field change across the earth's bow shock Comparison between observations and theory Magnetic field change across the earth's bow shock Comparison between observations and theory

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.3925w&link_type=abstract

(American Geophysical Union, Chapman Conference on Collisionless Shock Waves in the Heliosphere, Napa Valley, CA, Feb. 20-24, 19

Physics

Plasma Physics

19

Bow Waves, Interplanetary Magnetic Fields, Magnetic Field Configurations, Magnetohydrodynamics, Shock Waves, Solar Wind, Gas Dynamics, International Sun Earth Explorer 1, Mach Number, Magnetohydrodynamic Waves, Plasma Physics, Rankine-Hugoniot Relation, Space Plasmas, Supersonic Flow

Scientific paper

An examination has been conducted of 204 bow shock crossings observed in the magnetic field and plasma data on ISEE 1. Using the measured upstream field and plasma data, calculations were performed of the downstream field magnitudes by using the single-fluid MHD Rankine-Hugoniot jump conditions, and the results were compared with the observed downstream field magnitudes. It is found that the simple MHD model approach can predict the downstream field magnitude only on the average, but does so quite well if: (1) a polytropic index of approximately 5/3 is used in the calculations; (2) the angle between the upstream field and the shock normal is greater than 45 deg; and (3) the Alfven Mach (Ma) number is less than about 10. For angles less than 45 deg the predictions overestimate the observed field strength. For Ma greater than 10 the predictions underestimate the observations.

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