Simulation of the electron acoustic instability for a finite-size electron beam system

Details Simulation of the electron acoustic instability for a finite-size electron beam system Simulation of the electron acoustic instability for a finite-size electron beam system

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.7569l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, July 1, 1987, p. 7569-7580.

Computer Science

Sound

13

Acoustic Instability, Electron Beams, Plasma Heating, Satellite Sounding, Daytime, Electron Energy, Magnetohydrodynamic Stability, Particle In Cell Technique, Planetary Boundary Layer, Polar Cusps

Scientific paper

Simulations of the electron acoustic instability for a finite-size electron beam system are performed with a particle-in-cell code to investigate the heating phenomena associated with the instability and the width of the heating region. The results show that the beam radiates electrostatic electron acoustic waves whose decay time outside the beam agrees with the spatial decay length derived from the linear dispersion equation. The ambient cold electrons in a diffusion region surrounding the beam are heated to a higher temperature by absorbing the radiated electron acoustic waves, with the heating occurring mainly in the parallel direction. In the heat diffusion region, the temperature of the cold electrons decreases with distance from the beam with a temperature gradient length smaller than the decay length of the wave energy. The results are discussed with respect to the DE 1 plasma and wave observations in the polar cusp region.

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