Nonlinear evolution of a large-amplitude circularly polarized Alfven wave: Low beta

Details Nonlinear evolution of a large-amplitude circularly polarized Alfven wave: Low beta Nonlinear evolution of a large-amplitude circularly polarized Alfven wave: Low beta

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9913351g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A7, p. 13,351-13,362

Physics

21

Cascade Flow, Circular Polarization, Magnetohydrodynamic Waves, Plasma Pressure, Polytropic Processes, Sidebands, Wave Dispersion, Computerized Simulation, Interplanetary Magnetic Fields, Magnetohydrodynamic Turbulence, Solar Wind

Scientific paper

The nature of turbulent cascades arising from the parametric instabilities of a monochromatic field-aligned large-amplitude circularly polarized Alfven wave is investigated via direct numerical simulation for the case of low plasma Beta and no wave dispersion. The magnetohydrodynamic code permits nonlinear couplings in the parallel direction to the ambient magnetic field and one perpendicular direction. Compressibility is included in the form of a polytropic equation of state. Anisotropic turbulent cascades, similar to those found in early incompressible two-dimensional simulations, occur after nonlinear saturation of the parallel propagating decay instability. The turbulent spectrum can be divided into three regimes: the lowest wave numbers are dominated by lower sideband remnants of the parametric process, intermediate wave numbers display nearly incompressible dynamics, and the highest wave numbers are dominated by acoustic turbulence.

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