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Title:
An instability of finite amplitude circularly polarized Alfven waves
Authors:
Goldstein, M. L.
Affiliation:
AA(NASA, Goddard Space Flight Center, Laboratory for Extraterrestrial Physics, Greenbelt, Md.)
Publication:
Astrophysical Journal, Part 1, vol. 219, Jan. 15, 1978, p. 700-704. (ApJ Homepage)
Publication Date:
01/1978
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Circular Polarization, Decay Rates, Magnetohydrodynamic Waves, Solar Corona, Solar Wind, Wave Dispersion, Coupled Modes, Fourier Transformation, Magnetic Variations, Phase Velocity
DOI:
10.1086/155829
Bibliographic Code:
1978ApJ...219..700G

Abstract

A demonstration is presented that a finite-amplitude circularly-polarized Alfven wave is generally unstable in a MHD fluid. The wave decays by a four-wave coupling process in which the daughter waves are forward propagating random density and magnetic fluctuations and a backward-propagating magnetic wave. For parameters typical of the solar corona and the solar wind (thermal to magnetic energy density ratios between 0.1 and 1, and values between 0.1 and 0.9 for the ratio of magnetic energy density of the initial Alfven wave to that of the background magnetic field), large decay rates are found.

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