whole_HudspethJohnWarwick1983.pdf (9.54 MB)
The ionospheric Z ray return mechanism
thesisposted on 2023-05-26, 20:25 authored by Hudspeth, JW
Two alternative mechanisms, backscattering and tilt/wedge, for return of the ionospheric Z ray are examined. It is found that further experimental information is required in order to choose between them. Experimental tests of the mechanisms are proposed. The Llanherne HF radio-telescope was used as a narrow beam ionospheric sounder to obtain angle of arrival information on the 0, X and Z echoes. From the results of these experiments together with examination of h'f ionograms showing Z echoes it is concluded that neither mechanism satisfactorily explains the return of the Z echo in an. overwhelming majority of cases. A third mechanism is proposed which returns the Z ray by trapping in an ionospheric duct. This mechanism is able to explain many features of the Z echo and computer ra1 tracing of the model together with evidence from the existing literature suggests that this mechanism is the one operating in almost all cases of Z echo, except perhaps for those occurring at very high magnetic latitudes close to the Dip Pole.
Rights statementCopyright 1982 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). Thesis (Ph.D)--University of Tasmania, 1983.