Title :
The Mode Theory of VLF Ionospheric Propagation for Finite Ground Conductivity
Author_Institution :
National Bureau of Standards, Boulder, Colo.
fDate :
6/1/1957 12:00:00 AM
Abstract :
The space between the earth and the ionosphere is considered as a waveguide with sharply bounded walls. Employing a representation in terms of spherical wave functions of complex order, the field of a vertical dipole source is calculated for very low frequencies. It is shown that the effect of the finite conductivity of the ground is quite important for propagation to great distances. Good agreement is obtained with the experimental results of J. Heritage.
Keywords :
Conductivity; Earth; Electromagnetic waveguides; Frequency; Ionosphere; Optical propagation; Optical waveguides; Senior members; Wave functions; Waveguide theory;
Journal_Title :
Proceedings of the IRE
DOI :
10.1109/JRPROC.1957.278469
