Remarks on nonlinear relation among phases and frequencies in modulational instabilities of parallel propagating Alfven waves

Details Remarks on nonlinear relation among phases and frequencies in modulational instabilities of parallel propagating Alfven waves Remarks on nonlinear relation among phases and frequencies in modulational instabilities of parallel propagating Alfven waves

2006-08-24

arxiv.org/abs/physics/0608230v2

Nonlinear Processes in Geophysics, 13, 425-441, 2006

Physics

Plasma Physics

17 pages, Nonlinear Processes in Geophysics (published), the paper with full resolution images is http://www.copernicus.org/

Scientific paper

Nonlinear relations among frequencies and phases in modulational instability of circularly polarized Alfven waves are discussed, within the context of one dimensional, dissipation-less, unforced fluid system. We show that generation of phase coherence is a natural consequence of the modulational instability of Alfven waves. Furthermore, we quantitatively evaluate intensity of wave-wave interaction by using bi-coherence, and also by computing energy flow among wave modes, and demonstrate that the energy flow is directly related to the phase coherence generation.

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