The Cosmic Ray Ground-level Enhancement of 24 October 1989

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...

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Bibliographic Details
Published in:Publications of the Astronomical Society of Australia
Main Authors: Cramp, J. L., Humble, J. E., Duldig, M. L.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 1994
Subjects:
South Pole
Antarc*
Antarctica
South pole
Online Access:http://dx.doi.org/10.1017/s1323358000019627
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S1323358000019627
Description
Summary: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.

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