MAGNETOSPHERIC DUCTING OF ELECTROMAGNETIC WAVES EXCITED BY A LINE SOURCE DISTRIBUTION.
TEXAS UNIV AUSTIN ELECTRICAL ENGINEERING RESEARCH LAB
Pagination or Media Count:
An atmospheric model was used to study the propagation of energy from an electromagnetic source located in the earths 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 earths 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 earths surface are presented as a function of source frequency at a constant distance along the earths 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 earths surface at about 0.3 cycles per second. Author
- Radiofrequency Wave Propagation