Volume 8, Issue 1, March 2020, Page: 1-10
Effect of Some Solar Energetic Events on Cosmic Ray (CR) Ground Level Enhancement (GLE)
Okpala Kingsley Chukwudi, Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria
Abejoye Sylvester Ajisafe, Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria
Tsor James, Department of Physics, Benue State University, Markudi, Nigeria
Received: May 6, 2020;       Accepted: May 21, 2020;       Published: Jun. 16, 2020
DOI: 10.11648/j.ijass.20200801.11      View  275      Downloads  48
Abstract
Ground Level Enhancements (GLEs) are sudden and short-lived increases in cosmic rays intensities registered by neutron monitors and usually associated with powerful solar explosive events. This work examines the key features of forty-nine (49) Ground level enhancement (GLE) events with a view to understanding the possible link to their solar sources. These constitute the 22nd -71st GLE as recorded by the Oulu Neutron monitor. We have computed the increase rates of the GLE and have compared them with the associated solar activity parameters. It is observed that GLEs are more associated with Solar flares than CMEs during the minimum and ascending phase of the 11 year solar cycle when compared with GLEs that occurred during the maximum phase of the solar cycle. In general, more GLE events were associated with solar flares originating from the Northern hemisphere of the solar disk as compared with the southern hemisphere flares. 80% of GLE with percentage increase rate (PIR) <10% were linked with strong flares. There was no/weak statistical association between intensity of solar energetic events (solar flares, CMEs, etc) and increase rate of GLE. The harder solar energetic fluxes seem to be responsible for GLEs with high PIR and that the softer fluxes may be responsible for those with low PIR. These results have important implications for our present understanding of potential solar drivers of the GLEs.
Keywords
Cosmic Rays, Ground Level Enhancement, Solar Activity, Solar Flares
To cite this article
Okpala Kingsley Chukwudi, Abejoye Sylvester Ajisafe, Tsor James, Effect of Some Solar Energetic Events on Cosmic Ray (CR) Ground Level Enhancement (GLE), International Journal of Astrophysics and Space Science. Vol. 8, No. 1, 2020, pp. 1-10. doi: 10.11648/j.ijass.20200801.11
Copyright
Copyright © 2020 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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