Accession Number : AD0443170


Title :   ON PHASE CHANGES IN VERY-LOW-FREQUENCY PROPAGATION INDUCED BY AN IONOSPHERIC DEPRESSION OF FINITE EXTENT,


Corporate Author : NATIONAL BUREAU OF STANDARDS BOULDER CO


Personal Author(s) : Wait, James R


Report Date : 01 Nov 1963


Pagination or Media Count : 5


Abstract : An approximate analysis is given for VLF propagation in the earth-ionosphere waveguide of variable height. The height changes are not restricted to points along the great circle path connecting the transmitter and receiver. By choosing a simple example, we show that ionospheric perturbations lying within the first Fresnel zone are most effective in modifying the phase of the received signal. This paper is a sequel to an earlier one published in the Journal in 1961 about ionospheric depressions that were infinite in their transverse dimension. (Author)


Descriptors :   *IONOSPHERIC PROPAGATION , VERY LOW FREQUENCY , WAVEGUIDES , EARTH(PLANET) , PERTURBATION THEORY , QUANTUM THEORY , SCATTERING , ELECTRIC FIELDS , OPTICS , REFRACTIVE INDEX , ANTENNAS , HEIGHT FINDING


Distribution Statement : APPROVED FOR PUBLIC RELEASE