Accession Number : AD0266170

Title :   A METHOD FOR THE DETERMINATION OF LOWER IONOSPHERE PROPERTIES BY MEANS OF FIELD MEASUREMENTS ON SFERICS

Corporate Author : STANFORD RESEARCH INST MENLO PARK CALIF

Personal Author(s) : Harris,F. B. , Jr.

Report Date : AUG 1961

Pagination or Media Count : 1

Abstract : The propagation of audio-frequency and sub-audiofrequency waves between the earth and an ionosphere whose conductivity varies continuously with altitude is considered in detail. The fields are represented in terms of two scalar potentials satisfying appropriate wave equations in spherical coordinates. The wave equations are separable, and the general form of the solutions is discussed. It is shown that waves in this frequency range can be considered to be confined to a thin, but not sharply bounded, spherical shell about the earth. Greatly simplified radial wave equations in dimensionless form are derived incorporating this approximation. Solutions of these equations are given for two regions. An iterative method is presented, based on an integral equatio , which makes possible a computation of the radial wave function in the transition region and a joining of interior and exterior solutions for the propagating TM mode. The result is a direct mathematical relationship between the conductivity profile and the complex propagation constant as a function of frequency. (Author)

Descriptors :   *AERODYNAMIC CHARACTERISTICS, *ELECTROMAGNETIC RADIATION, *IONOSPHERIC PROPAGATION, ATMOSPHERIC ELECTRICITY, DETERMINATION, DIURNAL VARIATIONS, IONOSPHERE, MAGNETIC PROPERTIES, WAVE PROPAGATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE