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Unformatted text preview: The Pulsar Magnetosphere and its Role in Beaming Radiation Chetiya Sahabandu Department of Physics University of Cincinnati Cincinnati, Ohio 45221 December 3, 2001 Abstract A simple model is developed for the magnetosphere of a rotating aligned neutron star. It is shown that charged particles can be pulled out of the surface of the star by electric fields of the order of 10 10 V/cm. The beaming radiation process which is a consequence of the acceleration of these particles is briefly discussed. 1 1 Introduction 1.1 Neutron Stars The existence of a self gravitating body consisting mainly of neutrons was first pointed out by L.D. Landau in 1932. Baade and Zwicky  independently proposed the existence of neutron stars in 1934 and also stated that a supernova can change an ordinary star into neutron star. The first theoretical calculations of the structure of a neutron star were made by Oppenheimer and Volkoff  in 1939. They assumed the star to consist of an ideal Fermi gas of Neutrons. This model though crude yielded the main features of a neutron star. It set an upper limit to the mass of the neutron star: M < 1 . 7 M o . 1.2 Pulsars A pulsar is an object that emits short periodic pulses of radiation. Pulsars were first discovered in 1967 by J. Bell, working in the group of A. Hewish  at Cambridge. Golddiscovered in 1967 by J....
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