Abstract
Nonlinear interaction between highly oblique whistler wave and ion acoustic wave pertinent to magnetopause has been investigated. The density perturbation in whistler wave is supposed to be originated due to the presence of ion acoustic wave in the background. The ponderomotive force components arising due to the high amplitude pump wave, viz., whistler wave are constituted in the nonlinear dynamics of low frequency ion acoustic wave. The coupled nonlinear dynamical equations are then modelled in the form of modified nonlinear Schrödinger equation by considering adiabatic response of low frequency ion acoustic wave. The numerical simulation of this coupled nonlinear equation is performed to study the temporal evolution of nonlinear whistler wave. The obtained simulation results show that the temporal evolution also leads to the cascade of broadband turbulence spectrum at smaller wavelengths. The relevance of the obtained results with the observations of THEMIS spacecraft in the magnetopause region has been pointed out.
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