Anomalous skin effects in relativistic parallel propagating weakly magnetized electron plasma waves (original) (raw)
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Journal of Plasma Physics
Propagation characteristics (propagation regions and cutoffs) of parallel propagating modes (Langmuir, right- and left-handed circularly polarized waves) are studied for relativistic, weakly relativistic and non-relativistic magnetized electron plasma using the kinetic model. The dispersion relation for parallel propagating modes in relativistic electron plasma is investigated by employing the Maxwell–Boltzmann–J üttner distribution function and the final dispersion relation obtained is more general since no approximation is used. As the integrals in the relativistic dispersion relation cannot be done analytically so these integrals have been solved with the numerical quadrature approach. For etaleq1\eta \leq 1etaleq1 (ratio of rest mass energy to thermal energy), the increase in the effective mass of electrons will result in a change in the mass-dependent quantities (plasma frequency, electron cyclotron frequency, electron sound velocity, etc.) which in turn significantly affect the propagatio...
Almost-parallel electromagnetic wave propagation at frequencies near the electron plasma frequency
Astrophysics and Space Science, 1988
An approximate dispersion equation for almost-parallel electromagnetic wave propagation in a weakly relativistic plasma at frequencies near the electron plasma frequency is derived and investigated both analytically and numerically. It is pointed out that the cold plasma approximation cannot be applied to the analysis of these waves in any realistic (e.g., magnetospheric or astrophysical) plasma.
High frequency electromagnetic modes in a weakly magnetized relativistic electron plasma
Physics of Plasmas, 2010
Using the linearized Vlasov-Maxwell model, the polarization tensor for a weakly magnetized electron plasma is derived. For isotropic relativistic Maxwellian velocity distribution function, dispersion relations are obtained for both parallel and perpendicular propagations. The integrals ͑called Meijer G functions͒ that arise due to relativistic effects are examined in various limits and dispersion relations are derived for the nonrelativistic, weakly, strongly, and ultrarelativistic Maxwellian velocity distributions. It is generally observed that the propagation domains of the modes are enlarged as one proceeds from the nonrelativistic to the highly relativistic regime. Resultantly, due to the relativistic effects, the Whistler mode is suppressed in the R-wave, the nonpropagation band of X-mode is reduced, and the X-mode itself approaches the O-mode. Further, the results derived in the ultra-and nonrelativistic limits found to be in agreement with the earlier calculations ͓G. Abbas et al.
Effects of Magnetized Plasma on Electromagnetic Wave Propagating Parallel to Its Magnetic Field
IOSR Journals , 2019
The study of waves in plasmas provides significant information on plasma properties and is very useful in plasma diagnostics. This research is on "Effects of Magnetized Plasma on Electromagnetic Wave Propagating parallel to its magnetic field". Electromagnetic waves propagating parallel to magnetic field in magnetized plasma were analyzed. There are two modes parallel to the field, the L and R waves. Frequency values for the L-waves were obtained by substituting the values of wave number, k into its dispersion relation while the same frequency values were substituted to get the values of its refractive index (í µí± 2). The plasma frequency values obtained from Bohm-Gross' formulae for electron plasma waves were substituted into the dispersion relation to obtain the frequency values with cutoff at í µí¼ í µí°¿ and í µí¼ í µí±. These same frequency values were substituted into their related equations to obtain their respective refractive index. The results (tables & figures) show that properties of magnetized plasmas in the direction parallel to the magnetic field are different from those perpendiculars to it. The motion of plasma parallel to the magnetic field lines is associated with dynamics of sound waves.
Interaction of Relativistically Strong Electromagnetic Waves with a Layer of Overdense Plasma
Plasma–field structures that arise under the interaction between a relativistically strong electromagnetic wave and a layer of overdense plasma are considered within a quasistationary approximation. It is shown that, together with known solutions, which are nonlinear generalizations of skin-layer solutions, multilayer structures containing cavitation regions with completely removed electrons (ion layers) can be excited when the amplitude of the incident field exceeds a certain threshold value. Under symmetric irradiation, these cavitation regions, which play the role of self-consistent resonators, may amplify the field and accumulate electromagnetic energy.
Physical Review E, 2012
The propagation of circularly polarized electromagnetic waves along a constant background magnetic field in an electron-positron plasma is calculated by means of both a fluid and a kinetic theory treatment. In the fluid theory, relativistic effects are included in the particle motion, the wave field, and in the thermal motion by means of a function f , which depends only on the plasma temperature. In this work we analyze the consistency of the fluid results with those obtained from a kinetic treatment, based on the relativistic Vlasov equation. The corresponding kinetic dispersion relation is numerically studied for various temperatures, and results are compared with the fluid treatment. Analytic expressions for the Alfvén velocity are obtained for the fluid and kinetic models, and it is shown that, in the kinetic treatment, the Alfvén branch is suppressed for large temperatures.
Waves in relativistic electron beam in low-density plasma
Waves in electron beam in low-density plasma are analyzed. The analysis is based on complete electrodynamics consideration. Dependencies of dispersion laws from system parameters are investigated. It is shown that when relativistic electron beam is passed through low-density plasma surface waves of two types may exist. The first type is a high frequency wave on a boundary between the beam and neutralization area and the second type wave is on the boundary between neutralization area and stationary plasma.
Physics of Plasmas, 2018
Thermal momentum space anisotropy is ubiquitous in many astrophysical and laboratory plasma environments. Using Vlasov-Maxwell's model equations, a generalized polarization tensor for a collisionless ultra-relativistic unmagnetized electron plasma is derived. In particular, the tensor is obtained by considering anisotropy in the momentum space. The integral of moments of Fermi-Dirac distribution function in terms of Polylog functions is used for describing the border line plasma systems (TeTFe≈1) comprising arbitrary electron degeneracy, where Te and TFe, are thermal and Fermi temperatures, respectively. Furthermore, the effects of variation in thermal momentum space anisotropy on the electron equilibrium number density and the spectrum of electromagnetic waves are analyzed.