Nonlinear generation of whistler waves by an ion beam

Details Nonlinear generation of whistler waves by an ion beam Nonlinear generation of whistler waves by an ion beam

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9417259a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Dec. 1, 1989, p. 17259-17265. Research sponsored by DOE.

Physics

17

Field Aligned Currents, Ion Beams, Whistlers, Cometary Atmospheres, Earth Magnetosphere, Ion Temperature, Magnetohydrodynamic Waves

Scientific paper

An electromagnetic hybrid code is used to simulate a new mechanism for whistler wave generation by an ion beam. First, a field-aligned ion beam becomes unstable to the electromagnetic ion/ion right-hand resonant instability which generates large amplitude MHD-like waves. These waves then trap the ion beam and increase its effective temperature anisotropy. As a result, the growth rates of the electron/whistler instability are significantly enhanced, and whistlers start to grow above the noise level. At the same time, because of the reduced parallel drift speed of the ion beam, the frequencies of the whistlers are also downshifted. Full simulations were performed to isolate and separately investigate the electron/ion whistler instability. The results are in agreement with the assumption of fluid electrons in the hybrid simulations and with the linear theory of the instability.

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