Growth rates of new parametric instabilities occurring in a plasma with streaming He(2+)

Details Growth rates of new parametric instabilities occurring in a plasma with streaming He(2+) Growth rates of new parametric instabilities occurring in a plasma with streaming He(2+)

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9923449j&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A12, p. 23,449-23,459

Physics

19

Alpha Particles, Circular Polarization, Electromagnetic Pumps, Helium Ions, Ion Beams, Ion Cyclotron Radiation, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Plasma Pressure, Interplanetary Magnetic Fields, Interplanetary Medium, Particle Acceleration, Plasma Heating, Plasmas (Physics), Solar Wind

Scientific paper

We consider parametic instabilities of a circularly polarized pump Alfven wave, which propagates parallel to the ambient magnetic field; the daughter waves are also parallel-propagating. We follow Hollweg et al. (1993) and consider several new instabilites that owe their existence to the presence of streaming alpha particles. One of the new instabilites is similar to the famililar decay instability, but the daughter waves are a forward going alpha sound wave and a backward going Alfven wave. The growth rate of this instability is usually small if the alpha abundance is small. The other three new instabilities occur at high frequencies and small wavelengths. We find that the new instability which involves the proton cyclotron wave and alpha sound (i.e., the +f, - alpha) instability, which involves both the proton and alpha cycltron resonances, but if the pump wave must have low frequency and large amplitude. These instabilities may be a means of heating and accelerating alpha particles in the solar wind, but this claim is unproven until a fully kinetic study is carried out.

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