297 research outputs found
Excitation of zonal flow by the modulational instability in electron temperature gradient driven turbulence
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.Comment: 10 pages, 3 figure
Bright vector solitons in cross-defocusing nonlinear media
We study two-dimensional soliton-soliton vector pairs in media with
self-focusing nonlinearities and defocing cross-interactions. The general
properties of the stationary states and their stability are investigated. The
different scenarios of instability are observed using numerical simulations.
The quasi-stable propagation regime of the high-power vector solitons is
revealed.Comment: 6 pages, 7 figure
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