PARAMETRIC-INSTABILITY OF MHD WAVES IN A REFRACTIVE PLASMA WAVE-GUIDEWITH AN EXPONENTIAL DENSITY PROFILE AND AN OBLIQUE MAGNETIC-FIELD

Nonlinear resonance interactions of low-frequency MHD waves are consid ered in a refractive plasma waveguide with an exponential density prof ile and an oblique magnetic field. The waveguide eigenmodes are found, the conditions for the resonance sire ascertained, and reduced equati ons for the complex amplitudes of the waves are derived. In the approx imation of strong pump, the parameters of the low-frequency oscillatio ns excited are analyzed. The results obtained may be of interest in in terpreting phenomena observed in space, ionospheric, and laboratory pl asmas.