Abstract
A two-dimensional slab model for resistive drift waves in plasmas consisting of two coupled nonlinear partial differential equations for the density perturbation n and the electrostatic potential perturbation φ is investigated. The drift waves are linearly unstable, and a quasi-stationary turbulent state is reached in a finite time, independent of the initial conditions. Different regimes of the turbulent state can be obtained by varying the coupling parameter \U0001d49e, related to the parallel electron dynamics. The turbulence is described by using particle tracking and tools from chaos analysis. The largest Lyapunov exponent λ1 is calculated for different values of \U0001d49e to quantify the chaoticity and compared with Lagrangian inverse time scales obtained by tracking virtual fluid particles.
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