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Characterization of zonal flow generation in weak electrostatic turbulence

par Negrea, Marian;Petrisor, Iulian;Weyssow, Boris
Référence Physica Scripta, 77, 5, page (055502)
Publication Publié, 2008

Article révisé par les pairs

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Résumé :

The influence of the diamagnetic Kubo number, which is proportional to the diamagnetic drift velocity, on the zonal flow generation by an anisotropic stochastic electrostatic potential is considered from a semi-analytic point of view. The analysis is performed in the weak turbulence limit and as an analytical tool the decorrelation trajectory method is used. It is shown that the fragmentation of the drift wave structures (a signature of the zonal flow generation) is influenced not only by the anisotropy parameter and the electrostatic Kubo number as expected, but also by the diamagnetic Kubo number. Global Lagrangian averages of characteristic quantities are calculated and interpreted. © 2008 The Royal Swedish Academy of Sciences.