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Paper IPM / Physic / 6887  


Abstract:  
Modulational instability of a circularly polarized electromagnetic
wave, propagation along an external constant magnetic field in
plasma is investigated. the method is based on the derivation of a
nonlinear Schrodinger equation, which contains nonlinear terms
associated with trapped electrons and also relativistic electron
quiver velocity. Among different mechanisms of trapping the
collisionless process is considered. Since we are interested in
characteristic spatial scales larger than the Debye length, the
condition of quasineutrality is assumed. The maximum growth rate
is calculated and the result shows that the trapped particles
prevent the spatial localization of the electron cyclotron waves.
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