An instability of finite amplitude circularly polarized Alfven waves

Details An instability of finite amplitude circularly polarized Alfven waves An instability of finite amplitude circularly polarized Alfven waves

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...219..700g&link_type=abstract

Astrophysical Journal, Part 1, vol. 219, Jan. 15, 1978, p. 700-704.

Astronomy and Astrophysics

Astrophysics

118

Circular Polarization, Decay Rates, Magnetohydrodynamic Waves, Solar Corona, Solar Wind, Wave Dispersion, Coupled Modes, Fourier Transformation, Magnetic Variations, Phase Velocity

Scientific paper

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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