Accession Number : ADA186110

Title :   Electron Acceleration by Wave Processes in the Earth's Ionosphere.

Descriptive Note : Final technical rept. 15 Aug 85-31 Dec86,

Corporate Author : CALIFORNIA UNIV LOS ANGELES DEPT OF PHYSICS

Personal Author(s) : Morales, G J ; Maggs, J E

PDF Url : ADA186110

Report Date : 31 Dec 1986

Pagination or Media Count : 5

Abstract : The nonlinear modification of the electron distribution function caused by the interaction with a resonant electrostatic field is studied analytically using a perturbation analysis. This interaction produces tail heating and for a limited range of parameter values can form a bump in the distribution, which may lead to emission of secondary waves. These results are applied to the ionosphere's F and upper E regions in the context of ionospheric modification experiments using ground-based powerful HF transmitters. An analytic study is made of the second order modifications produced on the fast tail electron distribution function of a nonuniform plasma subjected to resonant excitation by wave sources. The source models considered can represent excitation by external electromagnetic waves propagating obliquely to the plasma density gradient, mode-conversion of electrostatic whistlers, beat of two transparent electromagnetic waves, and direct conversion from ripples in the density profile.

Descriptors :   *ELECTROSTATIC FIELDS, *PUMPING(ELECTRONICS), *IONOSPHERIC DISTURBANCES, *ELECTRON ENERGY, CONVERSION, DISTRIBUTION FUNCTIONS, ELECTROMAGNETIC RADIATION, ELECTRONS, EXCITATION, EXTERNAL, GRADIENTS, HEATING, IONOSPHERIC MODIFICATION, MODIFICATION, NONLINEAR SYSTEMS, NONUNIFORM, PARAMETERS, PERTURBATIONS, PLASMAS(PHYSICS), PROFILES, RESONANCE, RIPPLES, SECONDARY WAVES, TRANSPARENCE, ELECTRON DENSITY, WHISTLERS

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE