On the backscatter instability of solar wind Alfven waves

Details On the backscatter instability of solar wind Alfven waves On the backscatter instability of solar wind Alfven waves

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974jgr....79.4174c&link_type=abstract

Journal of Geophysical Research, vol. 79, Oct. 1, 1974, p. 4174-4178.

Computer Science

Sound

27

Backscattering, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Solar Wind, Wave Degradation, Landau Damping, Magnetoacoustic Waves, Mariner 5 Space Probe, Power Spectra, Wave Propagation

Scientific paper

A coherent Alfven wave propagating along the equilibrium magnetic field is unstable against decay into an Alfven wave traveling in the opposite direction and a sound wave. The stability of incoherent Alfven waves against this mode decay is considered, assuming that the sound waves are damped. The criterion for stabilizing waves with power spectral density Ik varying in proportion to k to the minus N-th power (where k is the wave number) is that N must be greater than 1. The results indicate that solar wind Alfven waves are stable in the wavelength range considered in Mariner 5 observations, although a mild instability is predicted for longer wavelengths.

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