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Time Variability of the Dispersion of the Crab Nebula Pulsar

Published online by Cambridge University Press:  07 February 2017

J. M. Rankin  and
J. A. Roberts
J. M. Rankin
Affiliation:
Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa, U.S.A.
J. A. Roberts
Affiliation:
Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa, U.S.A.

Abstract

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The dispersion of the Crab nebula pulsar was measured as a function of time from 10 May 1969 to 24 July 1970. Transient events occurred in the middle of June each year which coincided with the occultation of the pulsar by the solar corona. In addition there were 2 or 3 distinct events which produced enhancements of several times 1016 electrons cm-2; these were characterized by rise times of about 50 days and decay times several times longer. One event correlated with the frejump of the pulsar at the end of September 1969 and with the observation of optical activity in the quency nebula. A discussion is given of the interpretation of the variations in dispersion measure.

Type
Session 2
Information
Symposium - International Astronomical Union , Volume 46: The Crab Nebula , 1971 , pp. 114 - 117
Copyright
Copyright © Reidel 1971 

References

Allen, C. W.: 1964, Astrophysical Quantities , University of London, Athlone Press, London.Google Scholar
Counselman, C. C. III and Rankin, J. M.: 1970, in preparation.Google Scholar
Pacini, F.: 1970, ‘Physical Processes and Parameters in the Magnetosphere of NP 0532’, this symposium, Paper 7.3, p. 394.Google Scholar
Rankin, J. M.: 1970, ‘The 1969 Solar Occultation of the Crab Nebula Pulsar, NP 0532’, , .Google Scholar
Rankin, J. M., Comella, J. M., Craft, H. D. Jr., Richards, D. W., Campbell, D. B., and Counselman, C. C. III: 1970, Astrophys. J. 162, 707.Google Scholar
Rankin, J. M. and Roberts, J. A.: 1970, ‘Time Variability of the Dispersion of the Crab Nebula Pulsar’, to be submitted to Astrophys. J. Letters .Google Scholar
Richards, D. W. and Roberts, J. A.: 1970, ‘Timing Observations of the Crab Nebula Pulsar at the Arecibo Observatory’, this symposium, Paper 2.11, p. 125.Google Scholar
Scargle, J. D. and Harlan, E. A.: 1970, Astrophys. J. 159, L143.CrossRefGoogle Scholar