Cylindrical waveguide model with the thin shell approximation
Abstract
The authors investigate a modified cylindrical model of the ionosphereearth wave duct in which the anisotropic ionosphere is replaced by a suitably chosen surface resistance, so that the manylayer problem becomes a boundary value problem. The model is that previously proposed by Ledinegg et al. (1974), in which the electromagnetic field was excited by a row of magnetic dipoles situated parallel to the cylinder axis, and the series expansion of the field components was according to the modes of the cylindrical waveguide. Numerical evaluation in the presence of the resulting Hankel functions with complex indices was very laborious, so in the present paper the mode series is simplified with the aid of a thinshell approximation. Under certain conditions, a quasitwo dimensional representation of the field components is possible.
 Publication:

Kleinheubacher Berichte
 Pub Date:
 1976
 Bibcode:
 1976KlBer..19..593L
 Keywords:

 Atmospheric Models;
 Ionospheric Propagation;
 Waveguides;
 Boundary Value Problems;
 Geomagnetism;
 Propagation Modes;
 Series (Mathematics);
 Tensor Analysis;
 Thin Walled Shells;
 Very Low Frequencies;
 Geophysics