Danehkar, Ashkbiz and Saini, Nareshpal Singh and Hellberg, Manfred A. and Kourakis, Ioannis (2011) Electron-acoustic solitary waves in the presence of a suprathermal electron component. Physics of Plasmas, 18 (7). 072902/1-10. ISSN 1070-664X
Full text not available from this repository.Abstract
The nonlinear dynamics of electron-acoustic localized structures in a collisionless and unmagnetized plasma consisting of "cool" inertial electrons, "hot" electrons having a kappa distribution, and stationary ions is studied. The inertialess hot electron distribution thus has a long-tailed suprathermal (non-Maxwellian) form. A dispersion relation is derived for linear electron-acoustic waves. They show a strong dependence of the charge screening mechanism on excess suprathermality (through \kappa). A nonlinear pseudopotential technique is employed to investigate the occurrence of stationary-profile solitary waves, focusing on how their characteristics depend on the spectral index \kappa, and the hot-to-cool electron temperature and density ratios. Only negative polarity solitary waves are found to exist, in a parameter region which becomes narrower as deviation from the Maxwellian (suprathermality) increases, while the soliton amplitude at fixed soliton speed increases. However, for a constant value of the true Mach number, the amplitude decreases for decreasing \kappa.
| Item Type: | Article |
|---|---|
| Subjects: | Physical Sciences Physical Sciences > Physics Physical Sciences > Physics > Mathematical & Theoretical Physics Physical Sciences > Astronomy |
| Divisions: | UNSPECIFIED |
| Depositing User: | Ashkbiz Danehkar |
| Date Deposited: | 07 Aug 2011 20:15 |
| Last Modified: | 07 Aug 2011 20:15 |
| URI: | http://opendepot.org/id/eprint/453 |
Actions (login required)
| View Item |
