Physics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.9801g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, June 1, 1991, p. 9801-9804. Research supported by FONDECYT and Univer
Physics
61
Alpha Particles, Ion Cyclotron Radiation, Particle Acceleration, Solar Wind, Gyrofrequency, Particle Energy, Plasma Drift, Polarized Electromagnetic Radiation, Protons
Scientific paper
Preferential acceleration of alpha particles interacting with left-hand polarized ion cyclotron waves is studied. It is shown that a small positive drift velocity between alpha particles and protons can lead to alpha particle velocities well in excess of the proton bulk velocity. During the acceleration process, which is assumed to take place at heliocentric distances less than 0.3 AU, the alpha particle drift velocity should exceed the proton bulk velocity, and then the gap which exists around the alpha particle gyrofrequency should disappear. It is also shown that for proton thermal anisotropies of the order of those observed in fast solar wind, the waves either grow or are not damped excessively, so that the waves can exist and might thus lead to the observed differential speeds. However, the way in which the alpha particles exceed the proton velocity remains unexplained.
Elgueta R.
Gomberoff Luis
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