Physics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.2135l&link_type=abstract
Journal of Geophysical Research, vol. 81, May 1, 1976, p. 2135-2139.
Physics
4
Ion Beams, Ion Cyclotron Radiation, Magnetohydrodynamic Stability, Plasma-Electromagnetic Interaction, Solar Wind, Circular Polarization, Electromagnetic Wave Transmission, Electron Energy, Interplanetary Magnetic Fields, Ion Temperature
Scientific paper
The ion cyclotron instability in a system of ion beams counterstreaming along an external magnetic field is discussed. The instability sets in when either the ion temperature anisotropy or the relative streaming velocity exceeds a certain minimum (threshold) value. The dispersion relation for the left-hand circularly polarized electromagnetic mode in such a system is discussed, assuming that the electrons have no relative drift and that they provide only a uniform mobile background. The results are applied to a stability analysis of the solar wind double ion streams observed at 1922 UT on May 20, 1971. Instability criteria are derived for minimum, mean, and maximum values of the temperature anisotropy. It is shown that the lifetime of the double stream configuration is roughly 30 sec in the presence of the instability and that the instability acts to limit the ion temperature anisotropy in the double streams.
Buti B.
Lakhina Gurbax S.
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