Negative viscosity and generation of dissipative solitons and zonal dissipative structures by drift waves
Abstract
The stability of drift waves in a plasma with dissipation due to ion viscosity is examined. If the wave amplitude exceeds a threshold value, determined by ion-ion collisions, large-scale perturbations (i.e., with scales much greater than the drift wave length) grow. This effect is analogous to the negative viscosity effect in hydrodynamics. Maximum growth rate belongs to perturbations which are periodical along plasma inhomogeneity and constant in the transverse direction, i.e. azimuthal direction in cylindrical geometry (zonal dissipative structures). The analysis of the nonlinear stage of large-scale instability shows that the soliton-like large-scale structures of the electric field and vorticity are possible (dissipative solitons).
- Publication:
-
Unknown
- Pub Date:
- 1991
- Bibcode:
- 1991nvgd.rept.....C
- Keywords:
-
- Dissipation;
- Magnetohydrodynamic Stability;
- Nonlinearity;
- Plasma Waves;
- Plasmas (Physics);
- Solitary Waves;
- Viscosity;
- Wave Dispersion;
- Cylindrical Bodies;
- Electromagnetic Radiation;
- Inhomogeneity;
- Perturbation;
- Vorticity;
- Plasma Physics