Abstract
We investigate nonlinear stationary structures in a system of coupledequations describing drift wave turbulence and associatedself-consistent zonal flows. The short-scale drift wave turbulence isdescribed by a kinetic wave equation for the action density of driftwaves, whereas the longer-scale zonal flows are described by a dynamicequation for the m = n = 0 (toroidally and poloidally symmetric)component of the potential. Nonlinear stationary structures in amoving frame can be obtained by retaining novel effects associatedwith `trapped' and `untrapped' drift wave trajectories. We show thatdrift wave turbulence can self-consistently sustain coherent, radiallypropagating modulation envelope structures such as solitons, shocks,nonlinear wave trains, etc.
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