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Abstract

The first chapter in the thesis is concerned with the propagation of
electromagnetic waves in the ionosphere and in particular with the explanation
of magneto-ionic effects observed by echo sounding. The papers on
triple splitting, on gyro echoes and on the trapping of cosmic noise give, it
is believed, the first satisfactory accounts of these phenomena.
In the second chapter the observation and theory of natural electromagnetic
radiation propagated in the terrestrial magnetosphere is discussed.
Included in this group of papers is one on whistling atmospherics in which
the existence and the properties of nose whistlers were predicted Another
gives the first proposal that the natural very low frequency radiations may
be caused by Cerenkov radiation from fast electrons in the magnetosphere.
The remainder describe new techniques for observing the radiation and consequent
studies of its geographical distribution radiation and relation to
geomagnetic storms.
The papers in Chapter three all explore the properties of the cosmic
radio emissions in the frequency band between one and ten megacycles
/second. They derive from the first observations in this band which were
made by the author in association with G. Reber. The observation and the
theory of the intensity spectrum are discussed and new information on the
brightness distribution of the southern sky is given. Pronounced effects
caused by absorption of the radiation with the galaxy have been noted. It is
expected that in the futfre these will lead to the detailed study of the distribution
of tenuous ionised hydrogen in the galaxy.
The final Chapter describes observations of the decametric radio emissions
of Jupiter made incidentally during the investigations discussed in
Chapter three. These observations were at a lower wave frequency than any
made previously and were simpler to interpret. They led to a detailed theory
of the radiations which is given in this chapter.
All of these papers are original. Where the investigations they describe
were made jointly with another person or persons the order of the authors
indicates the relative contribution made by each.
None of this work has been submitted previously for the purposes of
the Degree of Doctor of Science.

Item Type:	Thesis - DSc
Authors/Creators:	Ellis, Graeme Reade Anthony
Keywords:	Ionosphere, Radio astronomy
Copyright Holders:	The Author
Copyright Information:	Copyright 1965 the Author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).
Additional Information:	Thesis (D.Sc.) - University of Tasmania, 1966. Includes bibliographical references
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