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Title: Radio pulses from extensive air showers
Author: Clay, Roger William
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1970
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Experimental work on radio emission from extensive air-showers is now a little over five years old. Thin thesis will be mainly concerned with work carried out in conjunction with the Haverah Park air-shower array in the last two years. Firstly, a brief description of air-showers and their astrophysical significance will be given. This will be followed by a short discussion of aspects of the Haverah Park array. Discussion of radio work begins with an examination of theories of radio emission which is followed by a critical discussion of the more important experiments which have been performed in the field. The contributions of the author to the study of radio emission are described in the remainder of the thesis. A discussion of techniques of radio pulse analysis is followed by a description of a simple method of estimating parameters of the radio pulse. It is shown that the shower track length in the atmosphere is an important factor in fixing the radio pulse magnitude. Experimentally, evidence is presented to Show that radio emission may be detected at 2 MHz and an upper limit is given for the pulse amplitude at 408 MHz. At 32 MHz, 44 MHz, and 60 MHz, it is demonstrated that the major emission mechanism is associated with the geomagnetic field. For Haverah Park air-showers it appears that the radio pulse amplitude is nearly proportional to the shower primary energy. The lateral spread of the emission behaves rather like a diffraction pattern, increasing with the distance of the source from the antenna and with the observational wavelength. A formula is given which can be made to fit all observed pulse heights. Finally, there is a short discussion of the possibility of detecting air-showers with an array using radio receivers as the prime detectors.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available