Abstract
This paper presents the nonlinear coupling between kinetic Alfvén waves (KAWs) and slow Alfvén waves (SWs) in high-β plasmas (β ≫me /mi), which is applicable to solar wind plasma. The pump KAW is perturbed by a low-frequency SW. When the ponderomotive nonlinearities are incorporated into the KAW and SW dynamics, the model equations of KAW and SW turn out to be the modified Zakharov system of equations. The growth rate of the instability has been calculated and its dependence on the perturbation wave number has also been presented. The relevance of these investigations for solar wind plasma has been discussed.
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