Physics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.3299q&link_type=abstract
Journal of Geophysical Research, vol. 86, May 1, 1981, p. 3299-3305.
Physics
28
Beta Factor, Linear Equations, Magnetohydrodynamic Stability, Magnetopause, Space Plasmas, Tearing Modes (Plasmas), Collisionless Plasmas, Current Sheets, Electric Fields, Kinetic Theory, Magnetic Field Configurations, Neutral Sheets, Particle Acceleration, Plasma Density
Scientific paper
The linear dispersion relation for a collisionless plasma in a sheared one-dimensional current sheet is calculated with reference to conditions in the daytime magnetopause. Calculations are extended to include plasmas with beta approximately equal to 1. It is found that the tearing mode eigenstructure and temporal growth rate are a sensitive function of the ratios l sub s/l sub G, l sub s/l sub T, and l sub s/l sub n, where l sub s is the shearing length of the magnetic field, l sub G is the gradient scale length, and l sub T is the temperature gradient scale length. In particular, if beta is approximately equal to 1, and l sub s is less than l sub G, l sub n, and l sub T, then the thickness of the layer over which particles are resonantly accelerated by the induction magnetic field is approximately rho, a thermal gyroradius. If the above conditions are not satisfied, plasma gradients may electrostatically stabilize the mode.
Coroniti Ferdinan V.
Quest Kevin B.
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