Accession Number:

AD0292166

Title:

A SOLUTION FOR ELF PROPAGATION IN THE EARTH-IONOSPHERE CAVITY BOUNDED BY AN INHOMOGENEOUS, ANISOTROPIC IONOSPHERIC MEDIUM

Descriptive Note:

Corporate Author:

AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s):

Report Date:

1962-10-31

Pagination or Media Count:

1.0

Abstract:

Propagation of ELF waves in the earth-ionosphere cavity is considered for an inhomogeneous, anisotropic ionospheric medium. The ionosphere is characterized macroscopically by a tensor conductivity based on recent theoretical and experimental data of electron densities and electron collision frequencies in the altitude range 50 to 120 km. For a plane stratified ionospheric medium, the tensor conductivity components may be approximated by rational functions of exponentials which allow solutions of the Maxwell equations to depend upon solutions of linear differential equations with polynomial coefficients. The problem in which the direction of propagation is perpendicular to the earths magnetic field and parallel to the earths surface is solved for vertically polarized waves under the assumption that the lower boundary of the ionosphere is located at approximately 75 km. The numerical results which consist of resonant frequencies and attenuation rates for frequencies below 60 cps are compared with identical quantities from a homogeneous isotropic model ionosphere derived elsewhere. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE