Fast wave stabilization/destabilization of drift waves in a plasma

Kumar, Pawan; Tripathi, V. K.
March 2013
Physics of Plasmas;Mar2013, Vol. 20 Issue 3, p032502
Academic Journal
Four wave-nonlinear coupling of a large amplitude whistler with low frequency drift wave and whistler wave sidebands is examined. The pump and whistler sidebands exert a low frequency ponderomotive force on electrons introducing a frequency shift in the drift wave. For whistler pump propagating along the ambient magnetic field Bsz⁁ with wave number kvector 0, drift waves of wave number kvector =kvector ⊥+k||z⁁ see an upward frequency shift when k⊥2/k02>4k||/k0 and are stabilized once the whistler power exceeds a threshold value. The drift waves of low transverse wavelength tend to be destabilized by the nonlinear coupling. Oblique propagating whistler pump with transverse wave vector parallel to kvector ⊥ is also effective but with reduced effectiveness.


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