Dissipative Effect on Formation of Ion Acoustic Solitons
Abstract
Effect of dissipation on the formation of ion acoustic solitons is investigated by experiments and by numerical calculations. In the experiments, a large amplitude initial perturbation does not evolve into solitons, but into a triangular wave with ripples on a leg when a neutral gas pressure is increased or when a random low frequency noise is superposed. Numerical analyses of the K-dV equation with dissipation terms show that an initial perturbation develops into a triangular wave when the dissipation depends on the wavenumber. Therefore the formation of the triangular wave in the experiment is not due to an increase of collisional damping, but to an increase of collusionless dissipation, i.e. Landau damping resulting from a decrease of the temperature ratio between the electrons and ions.
- Publication:
-
Journal of the Physical Society of Japan
- Pub Date:
- September 1977
- DOI:
- 10.1143/JPSJ.43.1054
- Bibcode:
- 1977JPSJ...43.1054W
- Keywords:
-
- Energy Dissipation;
- Ion Acoustic Waves;
- Landau Damping;
- Perturbation Theory;
- Solitary Waves;
- Gas Pressure;
- Noise Spectra;
- Particle Collisions;
- Pressure Effects;
- Wave Generation;
- Plasma Physics