Weak double layers in ion-acoustic turbulence
Abstract
The evolution of weak double layers in ion-acoustic turbulence in one and two-dimensional particle simulations is examined. Weak double layers (eφ≲Te) evolve in simulations when a subthermal electron drift is imposed on a long or nonperiodic system with Te/Ti≫1. Their growth rate increases with the electron drift, and they decay because of ion trapping. They do not form in weakly magnetized or unmagnetized two-dimensional (2-D) systems unless a nonuniformity is introduced in the initial or boundary conditions. When the plasma is strongly magnetized (ωce>ωpe), they emerge from 2-D ion-acoustic turbulence as coherent structures localized transversely to the magnetic field.
- Publication:
-
Physics of Fluids
- Pub Date:
- April 1985
- DOI:
- 10.1063/1.865028
- Bibcode:
- 1985PhFl...28.1055B
- Keywords:
-
- Ion Acoustic Waves;
- Magnetohydrodynamic Stability;
- Plasma Layers;
- Plasma Turbulence;
- Boundary Conditions;
- Boundary Value Problems;
- Computational Fluid Dynamics;
- Computerized Simulation;
- Two Dimensional Flow;
- Plasma Physics