Finite amplitude Alfven waves in a multi-ion plasma - Propagation, acceleration, and heating

Details Finite amplitude Alfven waves in a multi-ion plasma - Propagation, acceleration, and heating Finite amplitude Alfven waves in a multi-ion plasma - Propagation, acceleration, and heating

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.5023i&link_type=abstract

Journal of Geophysical Research, vol. 87, July 1, 1982, p. 5023-5029.

Physics

71

Ion Motion, Magnetohydrodynamic Waves, Particle Acceleration, Plasma Heating, Wave Propagation, Amplitudes, Heavy Ions, Solar Wind, Thermodynamic Properties

Scientific paper

An expression is derived for the wave action flux of finite-amplitude Alfven waves in a multi-ion plasma. The expression is valid in the presence of dissipative forces and permits an arbitrary angle between the average magnetic field and the wave vector. Applying the conservation of wave action and the first law of thermodynamics yields, for a multi-ion plasma, an expression for the spatial evolution of Alfven wave amplitude in the absence of dissipation. It also gives the relationship between the wave amplitude and the dissipative heating, as well as an expression for the acceleration of an ion species by finite-amplitude Alfven waves. It is pointed out that the acceleration comprises a nondissipative wave pressure that is identical to that derived previously under more restrictive conditions and a new term giving the acceleration that must accompany dissipative heating. The results are discussed in the context of the observations of heavy ions in the solar wind.

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