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Propagation along the magnetic field of a pulse current originated disturbance in a cold two-fluid plasma

Published online by Cambridge University Press:  13 March 2009

G.J. Lewak
G.J. Lewak
Affiliation:
Applied Electrophysics Department, University of California, La Jolla, California, and Institute for Radiation Physics and Aerodynamics
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Abstract

The propagation, along the magnetic field, of a point disturbance in a cold two fluid linear plasma is solved asymptotically in various space-time régimes. The main disturbance is a pulse front travelling at approximately the Alfvén speed divided by the electron to ion mass ratio. Its proffle envelope is an Airy function. It oscillates at the mean of the gyro-frequencies and is effiptically polarized. The disturbances remaining behind this front are of two kinds: an oscillation at the sum of the gyro-frequencies which is circularly polarized and represents the ‘extraordinary’ wave, and an oscillation at the ion gyro-frequency which is elliptically polarized with changing eccentricity and orientation of axis.

Type
Research Article
Information
Journal of Plasma Physics , Volume 1 , Issue 4 , November 1967 , pp. 435 - 449
Copyright
Copyright © Cambridge University Press 1967

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