Accession Number : AD0610982

Title :   COMPUTATION OF THE FIELD OF LF AND VLF RADIOWAVES OVER THE EARTH'S SURFACE UNDER NATURAL CONDITIONS,

Corporate Author : DIRECTORATE OF SCIENTIFIC INFORMATION SERVICES OTTAWA (ONTARIO)

Personal Author(s) : Al'pert,Ya. L.

Report Date : NOV 1959

Pagination or Media Count : 18

Abstract : Results are presented of theoretical calculations of the propagation, over the earth's surface, of electromagnetic waves in the 500- to 30,000-cycle range, with allowance for the stratiform inhomogeneity of the ionosphere and for the dependence of ionospheric conductivity on frequency. The pole equation is solved for the selected model of the ionosphere, and thus the wave-numbers of the discrete spectrum of waves forming the field at the point of observation are calculated. Analysis of the 'interference coefficient' has shown that the phase and amplitude of the field vary in a complicated irregular fashion in relation to distance and frequency. Graphs were constructed for the relationship between field intensity and frequency for various distances in the 500- to 10,000-km range. Field intensity measurements known from the literature and also results from other experiments are compared with the theoretical computations. A good agreement is found, even to a number of details.

Descriptors :   (*RADIO FIELDS, RADIO WAVES), (*RADIO WAVES, PROPAGATION), LOW FREQUENCY, VERY LOW FREQUENCY, IONOSPHERIC PROPAGATION, ELECTROMAGNETIC RADIATION, MATHEMATICAL ANALYSIS, GRAPHICS, USSR

Distribution Statement : APPROVED FOR PUBLIC RELEASE