Parametric decay instability in high-speed solar wind streams

Details Parametric decay instability in high-speed solar wind streams Parametric decay instability in high-speed solar wind streams

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.6713l&link_type=abstract

Journal of Geophysical Research, vol. 84, Nov. 1, 1979, p. 6713-6716.

Physics

4

High Speed, Ion Cyclotron Radiation, Magnetohydrodynamic Stability, Plasma Decay, Plasma Waves, Solar Wind, Wave Propagation, Interplanetary Magnetic Fields, Ion Acoustic Waves, Maxwell Equation, Propagation Modes, Vlasov Equations

Scientific paper

The parametric decay of a nonlinear left-hand circularly polarized transverse ion cyclotron pump wave in a high-speed solar-wind stream at 1 AU is studied. The pump wave is an exact steady-state solution of the Vlasov equation and Maxwell's equations and is assumed to decay parametrically into an ion acoustic wave and a product ion cyclotron wave. The case where all the waves propagate parallel to the uniform interplanetary magnetic field is considered, and two typical measurements of high-speed solar-wind protons are used to calculate the parametric-decay instability. The results indicate that the pump is weak and that the regions where it drives a mode unstable are very narrow.

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