Other
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2255h&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 20, p. 2255-2258
Other
51
Magnetohydrodynamics, Magnetosheath, Mathematical Models, Polytropic Processes, Space Plasmas, Thermodynamics, Adiabatic Equations, Equations Of State, Field Aligned Currents, Heat Flux, Magnetic Fields
Scientific paper
The magnetosheath plasma is usually neither isotropic nor adiabatic. This paper contains an attempt to decribe its thermodynamic properties in terms of two polytropic laws, p(sub perpendicular)/rho B(exp gamma(sub perpendicular)-1) = C(sub perpendicular) and p(sub parallel)B(exp gamma(sub parallel)-1)/rho(exp gamma(sub parallel)) = C(sub parallel), such that for gamma(sub perpendicular) = 2, gamma(sub parallel) = 3 the usual Chew-Goldberger-Low double-adiabatic expressions are recovered and for gamma(sub perpendicular) = 1, gamma(sub parallel) = 1 double-isothermal conditions are obtained. Using data from the AMPTE/IRM spacecraft, we show that the subsolar magnetosheath plasma may be better described by the double-polytropic laws than by the mirror instability threshold, in particular in the low beta region near the magnetopause. The inferred polytropic exponents vary from event to event but are typically in the ranges of gamma(sub perpendicular) = 0.94 +/- 0.10 and gamma(sub parallel) = 1.14 +/- 0.13 for the 29 cases we have examined.
Hau Lin-Ni
Paschmann Goetz
Phan Tai-Duc
Sonnerup Bengt U. Ö.
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