Parametric decays of a circularly polarized electromagnetic wave in an electron–positron plasma

1998 ◽  
Vol 5 (9) ◽  
pp. 3171-3179 ◽  
Author(s):  
V. Muñoz ◽  
L. Gomberoff
Keyword(s):  
Electromagnetic Wave ◽  
Circularly Polarized ◽  
Electron Positron

Nonlinear interaction of an intense electromagnetic wave with an unmagnetized electron—positron plasma

1992 ◽  
Vol 48 (1) ◽  
pp. 139-143 ◽  
Author(s):  
V. I. Berezhiani ◽  
L. N. Tsintsadze ◽  
P. K. Shukla
Keyword(s):  
Electromagnetic Wave ◽  
Wave Packet ◽  
Nonlinear Interaction ◽  
Large Scale ◽  
Relativistic Particle ◽  
Mass Variation ◽  
Circularly Polarized ◽  
Electron Positron ◽  
Density Perturbations ◽  
Longitudinal Plasma

The nonlinear interaction of an arbitrarily large-amplitude circularly polarized electromagnetic wave with an unmagnetized electron-positron plasma is considered, taking into account relativistic particle-mass variation as well as large-scale density perturbations created by radiation pressure. It is found that the interaction is governed by an equation for the electromagnetic wave envelope, which is coupled with a pair of equations describing fully nonlinear longitudinal plasma motions. The dynamics of the nonlinear electromagnetic wave packet is studied.

scholarly journals Dark and grey electromagnetic electron-cyclotron envelope solitons in an electron-positron magnetoplasma

2009 ◽  
Vol 75 (5) ◽  
pp. 575-580 ◽  
Author(s):  
P. K. SHUKLA ◽  
R. BINGHAM ◽  
A. D. R. PHELPS ◽  
L. STENFLO
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Wave ◽  
External Magnetic Field ◽  
Wave Packet ◽  
Electron Cyclotron ◽  
Envelope Soliton ◽  
Circularly Polarized ◽  
Envelope Solitons ◽  
Electron Positron ◽  
Cubic Nonlinear Schrödinger Equation

AbstractWe present an investigation of the amplitude modulation of an external magnetic field-aligned right-hand circularly polarized electromagnetic electron-cyclotron (EMEC) wave in a strongly magnetized electron-positron plasma. It is shown that the dynamics of the modulated EMEC wave packet is governed by a cubic nonlinear Schrödinger equation. The latter reveals that a modulated wave packet can propagate in the form of either a dark or a grey envelope soliton. This result could have relevance to the transport of electromagnetic wave energy over long distances via envelope solitons in the magnetospheres of pulsars and magnetars.

scholarly journals Pitch angle scattering of an energetic magnetized particle by a circularly polarized electromagnetic wave

2021 ◽  
Author(s):  
Paul M. Bellan
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Wave ◽  
Kinetic Energy ◽  
Potential Energy ◽  
Pitch Angle ◽  
Energetic Electron ◽  
Circularly Polarized ◽  
Angle Scattering ◽  
Background Magnetic Field ◽  
Pseudo Potential

<p>The interaction between a circularly polarized electromagnetic wave and an energetic gyrating particle is described [1] using a relativistic pseudo-potential that is a function of the frequency mismatch,  a measure of the extent to which ω-k<sub>z</sub>v<sub>z</sub>=Ω/γ is not true. The description of this wave-particle interaction involves a sequence of relativistic transformations that ultimately demonstrate that the pseudo potential energy of a pseudo particle adds to a pseudo kinetic energy giving a total pseudo energy that is a constant of the motion. The pseudo kinetic energy is proportional to the square of the particle acceleration (compare to normal kinetic energy which is the square of a velocity) and the pseudo potential energy is a function of the mismatch and so effectively a function of the particle velocity parallel to the background magnetic field (compare to normal potential energy which is a function of position). Analysis of the pseudo-potential provides a means for interpreting particle motion in the wave in a manner analogous to the analysis of a normal particle bouncing in a conventional potential well.  The wave-particle  interaction is electromagnetic and so differs from and is more complicated than the well-known Landau damping of electrostatic waves.  The pseudo-potential profile depends on the initial mismatch, the normalized wave amplitude, and the initial angle between the wave magnetic field and the particle perpendicular velocity. For zero initial mismatch, the pseudo-potential consists of only one valley, but for finite mismatch, there can be two valleys separated by a hill. A large pitch angle scattering of the energetic electron can occur in the two-valley situation but fast scattering can also occur in a single valley. Examples relevant to magnetospheric whistler waves are discussed. Extension to the situation of a distribution of relativistic particles is presented in a companion talk [2].</p><p>[1] P. M. Bellan, Phys. Plasmas 20, Art. No. 042117 (2013)</p><p>[2] Y. D. Yoon and P. M. Bellan, JGR 125, Art. No. e2020JA027796 (2020)</p>

scholarly journals Computation and Experiment on Linearly and Circularly Polarized Electromagnetic Wave Backscattering by Corner Reflectors in an Anechoic Chamber

Computation ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 55
Author(s):  
Mohammad Nasucha ◽  
Josaphat T. Sri Sumantyo ◽  
Cahya E. Santosa ◽  
Peberlin Sitompul ◽  
Agus H. Wahyudi ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Intensity Variation ◽  
Anechoic Chamber ◽  
Computational Tool ◽  
Circularly Polarized ◽  
Electric And Magnetic Fields ◽  
Difference Time

Electromagnetic wave backscattering by corner reflectors in an anechoic chamber is studied using our developed computational tool. The tool applies the Finite-Difference Time-Domain (FDTD) method to simulate the propagation of the wave’s electric and magnetic fields. Experimental measurement in an anechoic chamber is also carried out as a comparison. The two results show agreement, including the finding that the backscatter intensity variation amongst the four circularly polarized modes is significantly smaller than the variation amongst the four linearly polarization modes.

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