Electromagnetic Radiation Arising from Nonlinear Coupling between Longitudinal Excitations in Plasmas

Abstract

We consider a transverse component of a nonlinear current produced by coupling between longitudinal excitations in the plasma. The spectral and angular distribution of electromagnetic radiation arising from such a nonlinear current is calculated within the dipole approximation: the electromagnetic boundary conditions at the plasma-vacuum interface are explicitly taken into account. The intensity of such radiation depends strongly on the propagation characteristics of the transverse current in the plasma. As a specific example, radiation produced by coupling between the electron plasma oscillations and the ion-acoustic waves is considered.