On the acceleration of alpha particles in the fast solar wind

Details On the acceleration of alpha particles in the fast solar wind On the acceleration of alpha particles in the fast solar wind

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9712113g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A8, Aug. 1, 1992, p. 12,113-12,116. Research supported by FONDECY

Physics

12

Alpha Particles, Particle Acceleration, Solar Wind, Wave-Particle Interactions, Ion Cyclotron Radiation, Proton Beams, Solar Protons

Scientific paper

Recently, Gomberoff and Elgueta (1991) showed that in a plasma composed of anisotropic protons and alpha particles drifting along an external magnetic field with a small velocity relative to the protons, strong left-hand polarized electromagnetic ion cyclotron waves can be generated. These waves can accelerate the alpha particles to velocities well in excess of the proton bulk velocity. A more realistic model of the solar wind by considering a double-humped proton distribution is assumed. It is shown that the secondary proton beam has no important effects on the ion cyclotron waves for beam densities of the order of those observed in fast solar wind conditions. The fact that the alpha proton drift velocity is modulated by the Alfven velocity remains unexplained.

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