Abstract
The origin of anisotropic secondary flows, such as zonal flows and streamers, in drift wave turbulence is examined. A unified description including diffraction effects is given for zonal flow and streamer generation via envelope modulation of drift-wave packet. Stability boundaries, nonlinear growth rates and typical structure scales are determined for both streamer and zonal flow. A novel result is the determination of the characteristic width of those structures, which is found to depend on intrinsically nonlinear processes.
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