Theoretical study on parametric instabilities of Alfven waves : Toward an explication of the solar wind MHD turbulence

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Parametric instabilities of solar wind Alfven waves are theoretically and numerically studied. The following represent the main results of this study : (i) Important characteristics in the solar wind MHD turbulence are naturally reproduced by nonlinear evolution of Alfvenic turbulence with more realistic power spectrum. (ii) Even if a decay instability is dominant at the linear stage, the parent wave can mainly be dissipated by the modulational instability at the nonlinear stage, due to time evolution of the proton velocity distribution functions.