Accession Number : AD0642511

Title :   PROPAGATION OF VLF WAVES BELOW AN ANISOTROPIC STRATIFIED IONOSPHERE WITH A TRANSVERSE STATIC MAGNETIC FIELD.

Descriptive Note : Research rept.,

Corporate Author : SYLVANIA ELECTRONIC SYSTEMS-EAST WALTHAM MASS APPLIED RESEARCH LAB

Personal Author(s) : Galejs,Janis

Report Date : NOV 1966

Pagination or Media Count : 42

Abstract : The surface impedance of a cylindrically stratified anisotropic ionosphere has been computed in the presence of a transverse static magnetic field without requiring explicit representations of the individual cylindrical wave functions in the lower ionospheric layers. The propagation parameters are determined from the usual transcendental modal equation which is solved starting out with an initial real solution dependent on the reactive part of the ionospheric surface impedance. The surface impedance computations are continued below the ionospheric boundary height and the impedance reflected to the ground level by the ionosphere is compared with the ground impedance. The accuracy of the modal equation is shown to be comparable to a few percent uncertainty of the ground impedance for low conductivity ground. The propagation parameters of the first three waveguide modes are calculated for a number of ionosphere models which include the recent D-region models of Deeks. For propagation in the east to west direction, the phase velocity of the second mode is shown to be discontinuous when the real part of the ionospheric reflection coefficient undergoes a sign change. (Author)

Descriptors :   (*RADIO TRANSMISSION, ATMOSPHERES), VERY LOW FREQUENCY, IONOSPHERIC PROPAGATION, MAGNETIC FIELDS, ANISOTROPY

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE