Nonlinear aspects of wave propagation near the upper-hybrid mode conversion layer

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Abstract
It has been found that the effect of self‐modulation by a large‐amplitude wave can significantly modify the mode conversion process at the upper‐hybrid resonance. Under the condition ω2pe2c, an incoming extraordinary plane wave of sufficiently large amplitude can be mode converted to soliton‐like hot plasma waves. These waves can build up to very high intensities and allow nonlinear processes, such as parametric decay which is otherwise not possible due to high excitation thresholds, to occur close to the upper‐hybrid resonance. The investigation involves determining the modulational stability of the incoming extraordinary wave using the warm fluid model, and the hot plasma wave using the Vlasov model. An equation governing wave propagation in a nonuniform plasma taking into account the effect of self‐modulation is derived. This equation is analyzed to obtain the physical picture described.

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