| Revista: | Brazilian journal of physics |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000397891 |
| ISSN: | 0103-9733 |
| Autores: | Bashir, Muhammad Fraz1 Murtaza, G2 |
| Instituciones: | 1Government College University, Department of Physics, Lahore, Punjab. Pakistán 2GC University Lahore, Salam Chair in Physics, Lahore, Punjab. Pakistán |
| Año: | 2012 |
| Periodo: | Dic |
| Volumen: | 42 |
| Número: | 5-6 |
| Paginación: | 487-504 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Analítico |
| Resumen en inglés | 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., B1 ⊥ B0, 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 B1⊥B0. 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 Larmorradius 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 condi |
| Disciplinas: | Física y astronomía |
| Palabras clave: | Física, Fluidos, Física de plasmas, Cinemática, Tensor dieléctrico, Ondas de plasma, Anisotropía |
| Keyword: | Physics and astronomy, Physics, Fluids, Plasma physics, Kinematics, Dielectric tensor, Plasma waves, Anisotropy |
| Texto completo: | Texto completo (Ver PDF) |
