Abstract
Dynamics of coherent structures and turbulence of plasma drift waves.
Highlights
One of the most interesting and intriguing features of turbulence is its tendency to some kind of selforganization [1]
A simple model based on the Hasegawa-Mima equation is used to study dipole vortex interactions and turbulence of electrostatic drift waves in a plasma
In particular the proper orthogonal decomposition, we show that the turbulence can be characterized by a Geld of coherent structures, which dominates the dynamics of the system, and random waves interacting weakly with the coherent structures
Summary
F 18/51-, Marseille Cedez 20, France (Received. 11 April 1995; revised manuscript received 26 July 1995). 11 April 1995; revised manuscript received 26 July 1995). A simple model based on the Hasegawa-Mima equation is used to study dipole vortex interactions and turbulence of electrostatic drift waves in a plasma. It is shown that if nonlinear effects are important during vortex collisions, dipoles are broken into monopoles. Simulations of turbulence in both decaying and driven cases show the appearance of long-lived monopole structures. These coherent structures contribute to stop the cascade of energy to large scales, and to reach a self-organized stationary state. Some numerical evidence is done that Hasegawa-Mima turbulence has a long-time behavior that is much richer than the thermodynamic equilibrium state observed in two-dimensional hydrodynamics. In particular the proper orthogonal decomposition, we show that the turbulence can be characterized by a Geld of coherent structures, which dominates the dynamics of the system, and random waves interacting weakly with the coherent structures
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