The separation of the Cerenkov light and particle fronts in extensive air showers at sea level

This thesis describes a study of the separation of Cerenkov light and particle frontsin large cosmic ray air showers. The work was carried out during the winters of 1975/76 and 1976/77 at the British Universities Joint Air Shower array at Haverah Park. A description of the work to date on Cerenkov light in air showers is given to complement the study. A theoretical treatment, based on computer simulations, of the separation is given as well as the experimental results obtained during the two seasons. A description of a more advanced experiment studying Cerenkov light in E.A.S. is also presented. The experimental work described was the responsibility of the author.