Excitation of zonal flow by the modulational instability in electron temperature gradient driven turbulence

Details Excitation of zonal flow by the modulational instability in electron temperature gradient driven turbulence Excitation of zonal flow by the modulational instability in electron temperature gradient driven turbulence

2007-03-05

arxiv.org/abs/physics/0703050v1

Physics

Plasma Physics

10 pages, 3 figures

Scientific paper

The generation of large-scale zonal flows by small-scale electrostatic drift waves in electron temperature gradient(ETG) driven turbulence model is considered. The generation mechanism is based on the modulational instability of a finite amplitude monochromatic drift wave. The threshold and growth rate of the instability as well as the optimal spatial scale of zonal flow are obtained.

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