Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9867914 | Physics Letters A | 2005 | 6 Pages |
Abstract
Nonlinear interactions between zero-frequency electrostatic convective cells (CCs)/zonal flows (ZFs) and magnetostatic (MS) modes in a magnetoplasma are numerically investigated. These nonlinearly coupled flute-like modes can be spontaneously excited, and contribute significantly to the anomalous cross-field transport. While they are degenerate in a linear regime and form purely damped modes, their mutual nonlinear interactions give rise to large-scale coherent structures through a turbulent relaxation that leads to a self-organization via an inverse cascade. Remarkably, we find that nonlinear excitations of large-scale structures give rise to an effective cross-field diffusion coefficient that varies initially as â¼t1/2 with time, and enhances the transport level dramatically.
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Authors
Dastgeer Shaikh, P.K. Shukla,