Excitation of linearly stable waves in a multispecies plasma

Author

Roth, Ilan ; Hudson, Mary K.

Author_Institution

Space Sci. Lab., California Univ., Berkeley, CA, USA

Volume

17

Issue

2

fYear

1989

fDate

4/1/1989 12:00:00 AM

Firstpage

201

Lastpage

204

Abstract

Excitation of electrostatic modes as a result of the injection of an argon beam into a multispecies plasma is investigated. It is shown that the injection of a warm artificial beam into a thermal plasma may excite waves of significant amplitude with a range of phase velocities which are linearly stable. These waves appear as a result of the correlation between motions of an individual particle in a Vlasov fluid. When the free energy is derived from a warm beam and the linear instability diminishes due to the large temperature of the beam, the competing mechanism of thermal fluctuations is responsible for the main excitation of waves. This mechanism is valid for the various modes in a multispecies plasma with a higher enhancement at the lower hybrid than at the ion-ion hybrid modes

Keywords

argon; ionosphere; magnetosphere; plasma; plasma instability; plasma waves; plasma-beam interactions; Vlasov fluid; amplitude; electrostatic modes; excitation; free energy; ion-ion hybrid modes; ionosphere; linearly stable waves; lower hybrid mode; magnetosphere; multispecies plasma; phase velocities; temperature; thermal fluctuations; warm artificial beam; Argon; Electrostatics; Fluctuations; Frequency; Ion beams; Particle beams; Plasma measurements; Plasma stability; Plasma waves; Rockets;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.24625

Filename

24625