Physics
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....9010815g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Nov. 1, 1985, p. 10,815-10,822. DOE-sponsored research.
Physics
8
Electromagnetic Radiation, Electron Beams, Energetic Particles, Plasma-Particle Interactions, Collisionless Plasmas, Computerized Simulation, Isotropic Media, Nonrelativistic Mechanics, Phase Velocity, Whistlers
Scientific paper
This paper considers the linear theory of electromagnetic instabilities driven by an electron beam in a homogeneous, nonrelativistic, Vlasov plasma. The beam is relatively hot, isotropic in its own frame, and streams parallel or antiparallel to a magnetic field B. Numerical solutions of the full dispersion equation for propagation parallel or antiparallel to B are presented, and the linear properties of the whistler heat flux and electron beam firehose instabilities are exhibited and compared. Under a broad range of parmameters the former mode has the lower beam speed threshold, and the larger maximum growth rate. In addition, it is demonstrated that, for a sufficiently large relative beam density, relative beam temperature, and plasma beta the whistler heat flux instability has a much lower beam speed threshold than the electrostatic electron beam instability. The application of these instabilities to first-order Fermi acceleration of electrons at space plasma shocks is discussed.
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