School of Physics - Theses

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    The fading of HF radio waves obliquely reflected by the ionosphere
    Baker, Peter William ( 1970)
    The more prominent spatial and temporal irregularities of the ionosphere, interpreted from the abnormalities manifested by ionospherically propagated HF radio signals, are reviewed in Chapter I. Some of the applications of geometrical optics and diffraction theory of this problem are then presented. This is followed by a survey of various transionospheric , as well as vertical and oblique incidence, reflection investigations of the fluctuation of intensity (fading) of radio waves and the information derived there from concerning both the ionospheric irregularities and the structure of the radio wavefield at the ground. ...
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    The application of variational techniques to radio propagation in the ionosphere
    Bennett, John Atkinson ( 1971)
    Radio rays are introduced as curves playing a vital role in a short wavelength solution of the equations governing radio propagation in the ionosphere. Taking advantage of the variational equations satisfied by the rays, expressions are found for the variations of the phase path and a number of related quantities due to changes in the ionospheric medium or ray endpoints. The results are applied to the study of group propagation, Doppler shifts, Faraday fading, direction finding, power flow and ray reciprocity.