Nonlinear Alfvén wave modulation in the solar atmosphere |
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| Authors: | P K Shukla G Feix |
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| Institution: | (1) Faculty of Physics and Astronomy, Ruhr-University of Bochum, P.O. Box 10 21 48, 1 Bochum, F.R.G.;(2) Physics Department, Ruhr Academy of Sciences, P.O. Box 250 520, 1 Bochum, F.R.G. |
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| Abstract: | Nonlinear interaction of finite-amplitude Alfvén 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 Schrödinger equation for the Alfvén wave envelope and an equation for the plasma slow response that is driven by the ponderomotive force of the Alfvén wave packets. The modulational instability of a constant amplitude Alfvén 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 Alfvén wave packets could lead to localized structures. The relevance of our investigation to the solar atmosphere is discussed. |
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