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The Cosmic Ray Ground-level Enhancement of 24 October 1989

Published online by Cambridge University Press:  25 April 2016

J. L. Cramp
Affiliation:
Physics Department, University of Tasmania, GPO Box 252C, Hobart, Tas. 7001
J. E. Humble
Affiliation:
Physics Department, University of Tasmania, GPO Box 252C, Hobart, Tas. 7001
M. L. Duldig
Affiliation:
Australian Antarctic Division, c/o Physics Department, University of Tasmania, GPO Box 252C, Hobart, Tas. 7001

Abstract

The cosmic ray ground-level enhancement (GLE) of 24 October 1989 was the last of a series of GLEs associated with the same solar active region. Intensity enhancements were observed by at least 31 neutron monitors in the worldwide network, with the largest increase (~200%) observed at South Pole, Antarctica around 20:30 UT. Using a least-squares model fit to all available neutron monitor data, spectra, apparent source directions and particle pitch angle distributions have been derived. The effect of disturbed geomagnetic conditions has also been taken into account.

Type
High Energy Astrophysics
Copyright
Copyright © Astronomical Society of Australia 1994

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References

Debrunner, H., Flückiger, E.O. and Lockwood, J. A., 1982, Eighth European Cosmic Ray Symposium, Rome.Google Scholar
Duldig, M. L., Cramp, J. L., Humble, J. E., Smart, D. F., Shea, M. A., Bieber, J. W., Evenson, P., Fenton, K.B., Fenton, A. G. and Bendoricchio, M. B. M., 1993, Proc. Astron. Soc. Aust., 10, 211.CrossRefGoogle Scholar
Kobel, E., 1989, MSc Thesis, University of Bern.Google Scholar
Press, W. H., Flannery, B. P., Teukolsky, S. A. and Vetterling, W. T., 1989, In Numerical Recipes, The Art of Scientific Computing, pp. 532-7, Cambridge University Press.Google Scholar
Shea, M. A., 1990, Twenty-first Int. Cosmic Ray Conference, Adelaide, Vol. 12, p. 196.Google Scholar
Shea, M. A. and Smart, D. F., 1982, Space Sci. Rev., 32, 251.Google Scholar
Shea, M. A., Smart, D. F., Wilson, M. D. and Flückiger, E. O., 1991, Geophys. Res. Lett., 18, 209.Google Scholar

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