Accession Number : AD0475868


Title :   A STUDY OF NONLINEAR PHENOMENA IN THE PROPAGATION OF ELECTROMAGNETIC WAVES IN A WEAKLY IONIZED GAS.


Descriptive Note : Technical rept.,


Corporate Author : CALIFORNIA INST OF TECH PASADENA ANTENNA LAB


Personal Author(s) : Chan, Tsiu C


Report Date : Oct 1965


Pagination or Media Count : 95


Abstract : This paper is a study of nonlinear phenomena in the propagation of electromagnetic waves in a weakly ionized gas externally biased with a magneto-static field. The present study is restricted to the nonlinear phenomena arising from the interaction of electromagnetic waves in the ionized gas. The important effects of nonlinearity are wave-form distortion and generation of mixed frequencies. The wave-form distortion leads to cross-modulation of one wave by a second amplitude-modulated wave. The nonlinear effects are assumed to be small so that a perturbation method can be used. Boltzmann's kinetic equation with an appropriate expression for the collision term is solved by expanding the electron distribution function into spherical harmonics in velocity space. In turn, the electron convection current density and the conductivity tensors of the nonlinear ionized gas are found from the distribution function. Finally, the expression for the current density and Maxwell's equations are employed to investigate the effects of nonlinearity on the propagation of electromagnetic waves in the ionized gas, and also on the reflection of waves from an ionized gas semi-infinite extent. (Author)


Descriptors :   *PLASMAS(PHYSICS) , PROPAGATION , ELECTROMAGNETIC RADIATION , LUXEMBURG EFFECT , IONIZATION , FREQUENCY MODULATION , NONLINEAR SYSTEMS , AMPLITUDE MODULATION , IONOSPHERIC PROPAGATION , RADIO WAVES , EXPERIMENTAL DATA , IONOSPHERE , GAS IONIZATION , EQUATIONS OF MOTION , STATISTICAL FUNCTIONS , KINETIC THEORY


Subject Categories : Plasma Physics and Magnetohydrodynamics
      Radiofrequency Wave Propagation


Distribution Statement : APPROVED FOR PUBLIC RELEASE