Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/35851
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dc.contributor.authorCampbell, Philip Henry Montgomery.en
dc.date.accessioned2015-11-19T09:18:31Z-
dc.date.available2015-11-19T09:18:31Z-
dc.date.issued1979en
dc.identifier.urihttp://hdl.handle.net/2381/35851-
dc.description.abstractLow frequency (LF: 30 - 300 KHz) radio waves can be employed for communications purposes and as a means of probing the earth's lower ionosphere. In this thesis theoretical and experimental techniques are employed to investigate the propagation characteristics of LF waves in the spherical earth - ionosphere duct, with particular emphasis on high latitude conditions. The "wave-hop" theory of LF propagation, in conjunction with previously measured electron density and collision frequency profiles of the ionospheric D region, is used in a study of the behaviour of LF radio links under realistic operating conditions. The choice of frequency and receiver height is shown to have a critical effect on the received signal strengths during day - and night-time conditions. The influence of the geomagnetic field, ground conductivity, and ionospheric parameters on the occurence of regions of low signal strength are also assessed. The results of a series of airborne experiments are presented. Interference effects arising at a discontinuity in ground conductivity are demonstrated. Propagation data obtained at VLF and LF are interpreted in terms of D region models; the LF data are found to be considerably more sensitive to D region parameters than those obtained at VLF. Profiles providing a best fit for daytime conditions are derived; their accuracy and resolution and their photochemical implications are discussed. LF data are also employed to select a best fit nighttime electron density profile from a set of published profiles. An overall assessment of the theoretical and experimental aspects of this study concludes that an acceptable degree of consistency has been obtained.en
dc.language.isoenen
dc.rightsCopyright © the author. All rights reserved.en
dc.sourceProQuesten
dc.titleThe influence of the ionosphere on low frequency radio wave propagation.en
dc.typeThesisen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePh.D.en
dc.date.award1979en
dc.publisher.departmentPhysics and Astronomyen
dc.publisher.institutionUniversity of Leicesteren
dc.identifier.proquestU440796en
dc.identifier.cataloguecontrolx752992553en
Appears in Collections:Theses, Dept. of Physics and Astronomy
Leicester Theses

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