The electromagnetic ion cyclotron beam anisotropy instability

Details The electromagnetic ion cyclotron beam anisotropy instability The electromagnetic ion cyclotron beam anisotropy instability

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987p%26ss...35...51g&link_type=abstract

Planetary and Space Science, Volume 35, Issue 1, p. 51-59.

Physics

25

Scientific paper

Electromagnetic instabilities driven by an anisotropic, relatively cool ion beam are studied for the case in which both the beam and the instabilities propagate parallel or antiparallel to a uniform magnetic field. At modest beam-core relative drift speeds, sufficiently large perpendicular-to-parallel beam temperature ratios and sufficiently large plasma β, the mode of fastest growth rate is the ion cyclotron beam anisotropy instability. Because the right-hand polarized waves observed upstream of slow shocks in the Earth's magnetotail can lead to the appropriate beam anisotropy, the ion cyclotron instability may be present and account for the left-hand polarized magnetic waves observed there. Also, because of its relatively low phase speed, the ion cyclotron beam anisotropy instability may provide the scattering necessary for ion Fermi acceleration at slow shocks of sufficiently high plasma β.

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