The ion cyclotron dispersion relation in a proton-alpha solar wind

Details The ion cyclotron dispersion relation in a proton-alpha solar wind The ion cyclotron dispersion relation in a proton-alpha solar wind

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.2133i&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, April 1, 1984, p. 2133-2141.

Physics

44

Alpha Particles, Ion Cyclotron Radiation, Particle Acceleration, Solar Protons, Solar Wind, Wave Dispersion, Cyclotron Resonance, Heavy Ions, Plasma Waves, Plasma-Electromagnetic Interaction

Scientific paper

Recent models of preferential acceleration and heating of heavy ions in the solar wind have invoked a resonant interaction with parallel-propagating ion cyclotron waves. However, these waves must have frequencies in the cold plasma stop band (Ωα < ω < ωc) to accelerate alpha particles to speeds faster than the bulk plasma. Such waves cannot exist in a plasma containing cold alpha particles. The author investigates solutions to the WKB warm plasma dispersion relation in a proton-alpha plasma to determine when parallel ion cyclotron waves can propagate at ω = Ωα. He presents examples of the behavior of the dispersion curves in this resonant regime for several types of plasma states appropriate to the fast solar wind.

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