Accession Number : AD0649378

Title :   MAGNETOSPHERIC DUCTING OF ELECTROMAGNETIC WAVES EXCITED BY A LINE SOURCE DISTRIBUTION.

Descriptive Note : Technical rept.,

Corporate Author : TEXAS UNIV AUSTIN ELECTRICAL ENGINEERING RESEARCH LAB

Personal Author(s) : Laird,Charles E. , Jr. ; Bostick,F. X. , Jr

Report Date : 01 APR 1967

Pagination or Media Count : 51

Abstract : An atmospheric model was used to study the propagation of energy from an electromagnetic source located in the earth's upper atmosphere. An infinite line current source was used with a two-dimensional earth and atmosphere for this study. The model consisted of n isotropic layers with a real value of conductivity, permittivity and permeability in each layer. The earth's magnetic field was omitted from the model. A system of iterative computational matrices was used for numerical evaluation of an 11-layer model where attenuation and phase velocity profiles were stratified for the layer parameters. Curves of the magnitude of the tangential component of magnetic field intensity at the earth's surface are presented as a function of source frequency at a constant distance along the earth's surface from the source, and as a function of distance along the surface from the source at a constant source frequency. The results indicate that ducting or guiding of the energy occurs over a frequency range, and show a large peak of magnetic field intensity on the earth's surface at about 0.3 cycles per second. (Author)

Descriptors :   (*MAGNETOSPHERE, PROPAGATION), ELECTROMAGNETIC RADIATION, ATMOSPHERE MODELS, DUCTS, WAVE PROPAGATION, ITERATIONS

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE