Abstract

A finite amplitude whistler wave exerts a ponderomotive force on the electrons, creating a higher density duct and thus guiding itself to travel to long distances. This duct, however, is unstable to a short wavelength ( k, k z ⪢ k 0 z ) low frequency density perturbation, viz. oscillating two stream instability. In this process, the whistler pump wave excites a low frequency perturbation and two lower hybrid sidebands. The threshold for the instability is determined by the convection losses of sideband energy from the whistler duct. Threshold electric fields for the onset of the instability have been calculated in the magnetosphere for a range of pump frequency.

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