Acceleration and heating of heavy ions by circularly polarized Alfvén waves

Details Acceleration and heating of heavy ions by circularly polarized Alfvén waves Acceleration and heating of heavy ions by circularly polarized Alfvén waves

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10115661g&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A7, p. 15661-15666

Physics

Plasma Physics

37

Interplanetary Physics: Solar Wind Plasma, Space Plasma Physics: Waves And Instabilities, Space Plasma Physics: Wave/Particle Interactions

Scientific paper

We study the dispersion relation of left-hand-polarized Alfvén waves in multicomponent plasmas. If initially the plasma components are not drifting relative to each other, the Alfvén waves propagate until they meet the gyrofrequency of the species with the largest Ml=ml/zlmp value (ml is the ion mass, zl is the degree of ionization, and mp is the proton mass). As a result of resonance absorption, these ions are heated and accelerated by quasi-linear resonant interaction. When these ions reach a given velocity, the dispersion relation of the Alfvén waves changes drastically. The Alfvén branch of the dispersion relations no longer goes to the gyrofrequency of the ion species with the largest Ml value, but it goes to the gyrofrequency of the species with the second largest Ml value. In this way, more and more channels open up. We apply these results to high-speed solar wind streams, and we argue that Alfvén waves generated in coronal holes or in nearby regions can heat and accelerate heavy ions.

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