Ion firehose instability in plasmas with plasma particles described by product bi-kappa distributions

Journal Article · Sat Nov 15 04:00:00 EST 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4900766· OSTI ID:22299746

Santos, M. S. dos

We investigate the dispersion relation for low frequency electromagnetic waves propagating parallel to the ambient magnetic field, considering that the velocity distributions of ions and electrons can be either bi-Maxwellian of product bi-kappa distributions. The effect of the anisotropy and non-thermal features associated to the product-bi-kappa distributions on the firehose instability are numerically investigated. The general conclusion to be drawn from the results obtained is that the increase in non-thermal features which is consequence of the decrease of the κ indexes in the ion distribution contributes to increase the instability in magnitude and wave number range, in comparison with bi-Maxwellian distributions with similar temperature anisotropy, and that the increase of non-thermal features in the electron distribution contributes to the quenching of the instability, which is nevertheless driven by the anisotropy in the ion distribution. Significant differences between results obtained either considering product-bi-kappa distributions or bi-kappa distributions are also reported.

• OSTI ID: 22299746
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 21; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANISOTROPY
COMPARATIVE EVALUATIONS
DISPERSION RELATIONS
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELECTRONS
HOSE INSTABILITY
IONS
MAGNETIC FIELDS
PLASMA