The thickness of the magnetosheath - Constraints on the polytropic index

Details The thickness of the magnetosheath - Constraints on the polytropic index The thickness of the magnetosheath - Constraints on the polytropic index

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1821f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Oct. 1991, p. 1821-1824. Research supported by University of California.

Physics

81

Bow Waves, Magnetosheath, Polytropic Processes, Shock Waves, International Sun Earth Explorers, Rankine-Hugoniot Relation, Statistical Analysis

Scientific paper

The average positions and shapes of the bow shock and the magnetosphere were determined, using the results of a statistical analysis of 351 independent bow shock crossings and 233 independent magnetopause crossings by the ISEE-1 spacecraft in the years 1977-1980. Ellipsoidal models of the respective boundaries were obtained. The standoff distances for the bow shock and the magnetopause were found to be 13.7 +/-0.2 R(E) and 10.3 +/-0.3 R(E), respectively; with these values and the average upstream magnetosonic Mach number for this time period, the polytropic index gamma was calculated using the empirical relation of Spreiter et al. (1966).

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