Parametric decay of linearly polarized shear Alfvén waves in oblique propagation: One and two-dimensional hybrid simulations

Details Parametric decay of linearly polarized shear Alfvén waves in oblique propagation: One and two-dimensional hybrid simulations Parametric decay of linearly polarized shear Alfvén waves in oblique propagation: One and two-dimensional hybrid simulations

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3720101m&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 20, CiteID L20101

Physics

Plasma Physics

1

Space Plasma Physics: Wave/Wave Interactions, Space Plasma Physics: Wave/Particle Interactions (2483, 6984), Interplanetary Physics: Solar Wind Plasma, Space Plasma Physics: Kinetic And Mhd Theory, Interplanetary Physics: Mhd Waves And Turbulence (2752, 6050, 7836)

Scientific paper

The parametric instability of a monochromatic shear Alfvén wave in oblique propagation with respect the ambient magnetic field is investigated in a kinetic regime, performing one-dimensional (1-D) and two-dimensional (2-D) hybrid simulations. The parallel component of the mother wave is found to be subject to a parametric decay which excites an ion-acoustic wave along the magnetic field and a backward propagating daughter shear Alfvén wave, as in the instability for a purely parallel mother wave. At the same time, the acoustic wave generation supports the acceleration of a velocity beam in the ion distribution function, due to the non-linear trapping of protons. Moreover, the instability leads to the generation of broad band oblique spectra of coupled Alfvénic and compressive modes with variable perpendicular wavevectors, and, as a consequence, the magnetic field after saturation is characterized by a strong transverse modulation.

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