Generation of a a.d.c. field by nonlinear electromagnetic waves in relativistic plasmas.
Abstract
A finite amplitude linearly polarized electromagnetic wave propagating in a relativistic plasma, is found to generate the longitudinal d.c. as well as the oscillating electric field at the second harmonic. In a plasma consisting of only electrons and positrons, these fields cannot be generated. The evolution of the electromagnetic waves is governed by the nonlinear Schrödinger equation which shows that the electromagnetic solitons are always possible in ultrarelativistic plasmas (electronion or electronpositron) but in a plasma with relativistic electrons and nonrelativistic ions, these solitons exist only if 1≪(KT _{e}/m_{e}C^{2})<(2m _{i}/15m_{e});m _{e} andm _{i} being the electron and ion mass andT _{e} the electron temperature. Both the d.c. electric field and the solitons provide a nonlinear mechanism for anomalous acceleration of the particles. This model has direct relevance to some plasma processes occurring in pulsars.
 Publication:

Astrophysics and Space Science
 Pub Date:
 September 1981
 DOI:
 10.1007/BF00655902
 Bibcode:
 1981Ap&SS..79...25L
 Keywords:

 Electromagnetic Wave Transmission;
 Plasma Currents;
 PlasmaElectromagnetic Interaction;
 Pulsars;
 Relativistic Plasmas;
 Solitary Waves;
 Electric Fields;
 Magnetohydrodynamic Stability;
 Nonlinear Systems;
 Particle Acceleration;
 Plasma Equilibrium;
 Polarized Electromagnetic Radiation;
 Propagation Modes;
 Pulsar Magnetospheres;
 Schroedinger Equation;
 Stellar Atmospheres;
 Stellar Models;
 Plasma Physics;
 Pulsars:Relativistic Plasma