Modulational and decay instabilities of Alfven waves - Effects of streaming He(2+)

Details Modulational and decay instabilities of Alfven waves - Effects of streaming He(2+) Modulational and decay instabilities of Alfven waves - Effects of streaming He(2+)

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3491h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A3, p. 3491-3500.

Computer Science

Sound

51

Helium Ions, Magnetoacoustic Waves, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Solar Wind, Wave Dispersion, Circular Polarization, Plasma Composition, Wave Propagation

Scientific paper

The parametric instability of a circularly polarized Alfven wave propagating along the background magnetic field are considered, with emphasis on the effects of a second ion species, He(2+), which drifts relative to the protons. Even though its abundance is small, the He(2+) modifies the dispersion relation of the 'pump' Alfven wave and introduces a new sound wave (alpha sound) in addition to the usual sound wave carried primarily by the electrons and protons. Instabilities which are close to the He(2+) gyroresonance are found. This may provide a means of directly transferring Alfven wave energy to the alpha particles, if the alphas are able to resonantly extract energy from the unstable waves without quenching the instability altogether. Instabilities which are close to the alpha particle sound speed are also found.

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