Computer simulations of electromagnetic cool ion beam instabilities

Details Computer simulations of electromagnetic cool ion beam instabilities Computer simulations of electromagnetic cool ion beam instabilities

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.4188g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, April 1, 1986, p. 4188-4200. Research supported by the University of

Physics

53

Electromagnetic Wave Transmission, Ion Beams, Magnetic Disturbances, Magnetohydrodynamic Stability, Shock Waves, Space Plasmas, Bow Waves, Computerized Simulation, Geomagnetic Tail, Ion Density (Concentration), Ion Temperature, Magnetic Flux, Plasma Drift

Scientific paper

Electromagnetic ion beam instabilities driven by cool ion beams at propagation parallel or antiparallel to a uniform magnetic field are studied using computer simulations. The elements of linear theory applicable to electromagnetic ion beam instabilities and the simulations derived from a one-dimensional hybrid computer code are described. The quasi-linear regime of the right-hand resonant ion beam instability, and the gyrophase bunching of the nonlinear regime of the right-hand resonant and nonresonant instabilities are examined. It is detected that in the quasi-linear regime the instability saturation is due to a reduction in the beam core relative drift speed and an increase in the perpendicular-to-parallel beam temperature; in the nonlinear regime the instabilities saturate when half the initial beam drift kinetic energy density is converted to fluctuating magnetic field energy density.

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