Theory of low frequency wave propagation
Abstract
A theoretical analysis of the effects of the propagation of electromagnetic waves on the atmosphere is presented. Wait's theory is used to describe the field and the surface impedance, and consideration is given to the ionospheric reflection factor, the Hertz vector, and the reflection of em waves from plane anisotropic plasmas. The field arising from a vertical electric dipole is formulated, assuming iosotropic reflection from the boundaries of the terrestrial waveguide. Reflection factors are calculated for an inhomogeneous anisotropic model of the ionosphere. Solutions to the mode eigenvalue equation are discussed, noting that attenuation and phase velocity can be obtained from either plane or spherical waveguide models. VLF range waves are examined together with the effects of the height of the reflecting ionospheric layer, the direction of propagation, the local time, and the waveguide curvature.
 Publication:

IN: CRC handbook of atmospherics. Volume 2 (A8345876 2242). Boca Raton
 Pub Date:
 1982
 Bibcode:
 1982crc.....2..133H
 Keywords:

 Atmospheric Attenuation;
 Atmospherics;
 Electromagnetic Wave Transmission;
 Ionospheric Propagation;
 Low Frequencies;
 Radio Communication;
 Atmospheric Electricity;
 Earth Surface;
 Electric Dipoles;
 Field Theory (Physics);
 Phase Velocity;
 Propagation Modes;
 Radio Attenuation;
 Reflectance;
 Resonant Frequencies;
 Communications and Radar