Abstract
Nonlinear interaction of finite-amplitude Alfven waves with non-resonant finite-frequency electrostatic and stationary electromagnetic perturbations is considered. This interaction is governed by a pair of coupled equations consisting of nonlinear Schrodinger equation for the Alfven wave envelope and an equation for the plasma slow response that is driven by the ponderomotive force of the Alfven wave packets. The modulational instability of a constant amplitude Alfven pump is investigated and some new results for the growth rate of the instability are presented. It is found that a possible stationary state of the modulated Alfven wave packets could lead to localized structures. The relevance of our investigation to the solar atmosphere is discussed.
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