NDLI: Effect of Temperature Anisotropy on Various Modes and Instabilities for a Magnetized Non-relativistic Bi-Maxwellian Plasma

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Effect of Temperature Anisotropy on Various Modes and Instabilities for a Magnetized Non-relativistic Bi-Maxwellian Plasma

Brazilian Journal of Physics : Volume 42, Issue 3-4, August 2012

Brazilian Journal of Physics : Volume 42, Issue 1-2, April 2012

Brazilian Journal of Physics : Volume 41

Effect of Temperature Anisotropy on Various Modes and Instabilities for a Magnetized Non-relativistic Bi-Maxwellian Plasma

Content Provider	Springer Nature Link
Author	Bashir, Muhammad Fraz Murtaza, G.
Copyright Year	2012
Abstract	Using kinetic theory for homogeneous collisionless magnetized plasmas, we present an extended review of the plasma waves and instabilities and discuss the anisotropic response of generalized relativistic dielectric tensor and Onsager symmetry properties for arbitrary distribution functions. In general, we observe that for such plasmas only those modes whose magnetic-field perturbations are perpendicular to the ambient magnetic field, i.e., B $_{1}$ $\bot $ B $_{0}$, are effected by the anisotropy. However, in oblique propagation all modes do show such anisotropic effects. Considering the non-relativistic bi-Maxwellian distribution and studying the relevant components of the general dielectric tensor under appropriate conditions, we derive the dispersion relations for various modes and instabilities. We show that only the electromagnetic R- and L- waves, those derived from them (i.e., the whistler mode, pure Alfvén mode, firehose instability, and whistler instability), and the O-mode are affected by thermal anisotropies, since they satisfy the required condition $\mathbf{B}_{1}\bot \mathbf{B}_{0}$ . By contrast, the perpendicularly propagating X-mode and the modes derived from it (the pure transverse X-mode and Bernstein mode) show no such effect. In general, we note that the thermal anisotropy modifies the parallel propagating modes via the parallel acoustic effect, while it modifies the perpendicular propagating modes via the Larmor-radius effect. In oblique propagation for kinetic Alfvén waves, the thermal anisotropy affects the kinetic regime more than it affects the inertial regime. The generalized fast mode exhibits two distinct acoustic effects, one in the direction parallel to the ambient magnetic field and the other in the direction perpendicular to it. In the fast-mode instability, the magneto-sonic wave causes suppression of the firehose instability. We discuss all these propagation characteristics and present graphic illustrations. The threshold conditions for different instabilities are also obtained.
Starting Page	487
Ending Page	504
Page Count	18
File Format	PDF
ISSN	01039733
Journal	Brazilian Journal of Physics
Volume Number	42
Issue Number	5-6
e-ISSN	16784448
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-07-03
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plasma waves and instabilities Temperature anisotropy Relativistic plasma Nonrelativistic plasma Homogeneous and magnetized plasmas R- and L- waves Whistler wave and instability Aflvén wave Firehose instability X-mode O-mode Bernstein wave Kinetic Alfvén Waves Inertial Alfvén wave Fast mode and fast mode instability Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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