Physics – Plasma Physics
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978p%26ss...26.1037c&link_type=abstract
Planetary and Space Science, vol. 26, Nov. 1978, p. 1037-1061. Research supported by the Science Research Council.
Physics
Plasma Physics
27
Current Sheets, Geomagnetic Tail, Plasma Physics, Pressure Distribution, Pressure Effects, Adiabatic Conditions, Anisotropy, Magnetic Effects, Magnetic Flux, Plasma Density, Plasma Pressure, Two Dimensional Models
Scientific paper
The effects of plasma pressure anisotropy on the equilibrium structure of pressure-dominated current sheets are studied systematically on the basis of a detailed analysis of a simple two-dimensional model in which the magnetic-field and plasma pressures are assumed to vary exponentially along the system. The particles are assumed to behave adiabatically in the field, and conditions under which equilibria exist are investigated. It is found that in all cases except that of isotropic plasma pressure, adiabatic solutions cease to exist if the field inflation provided by the plasma currents proceeds beyond a certain critical value, expressed in terms of a critical plasma beta at the center of the current sheet. The results indicate that the marginal firehose stability condition can be met at the center of the plasma sheet in the geomagnetic tail with quite small pressure anisotropies (about 10%).
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