Volume 8, Issue 1, January 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  26      Downloads  21
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.
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
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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.
Andriopoulou M., M., Mavromichalaki H., Proka-Papadema P., Plainaki C., Belov A., Eroshenko E., (2011), Solar activity and associated ground level enhancements of solar cosmic rays during solar cycle 23, Astrophysics Space Science Transactions, 7, 439-443.
Belov A., Eroshenko E., Mavromichalaki H., Plainaki C., and Yanke J. (2005), Solar Cosmic Rays during the extremely high ground level enhancement on 23 February 1956, Annales Geophysics, 23, 2281-2291.
Belov, A., Eroshenko, K., Kryakunova, O., Kurt, V., and Yanke, V. (2009), Ground level enhancements of solar cosmic rays during the last solar cycles, Geomagn. Aeronomy, 50, 21-33.
Cohen, C. M. S., Luhmann, J. G., Mewaldt, R. A., Mays, M. L., Bain, H. M., Li, Y., et al. (2017). Searching for extreme SEP events with STEREO. In Proceedings of 35th ICRC Conference, PoS (ICRC2017), 134, 1–8.
Cohen C. M. S. and Mewaldt, R. A., (2018), The Ground-Level Enhancement Event of September 2017 and Other Large Solar Energetic Particle Events of Cycle 24, Space Weather, 16 (10), 1616-1623.
Cliver, E. W., Kahler, S. W. Shea, M. A. and Smart, D. F. (1982), Injection onsets of 2GeV electrons protons, IMeV electrons and 100Kev electrons in Solar Cosmic ray flares, Astrophysics, Journal, 260, 362-370.
Dorman, L. (2004), Cosmic ray in the Earth`s Atmosphere and underground, Kluwer Academic Publishers, Dordrecht., Netherland.
Firoz, K. A., and Kudela, K. (2007), Cosmic rays and low energy particle fluxes, OMDS proceedings of contributed papers, part 11: physics of plasmas and lionized Media, edited by J. Safrank Ora and J. Parlu, ppl 106-110.
Firoz K. A., Cho K. –s., Hwang J.. Phani Kumar D. V., Lee J. J., Oh S. Y., Kaushik S. C., Kudela K., Rybansky M., Dorman L.. (2010), Characteristics of ground level enhancement associated solar flare, coronal mass ejections, and solar energetic particles, Journal of Geophysical Research, 115, A09105.
Firoz, K. A., MoonY.-J., ChoK.-S., HwangJ., ParkY. D., KudelaK., and DormanL. I., (2011), On the relationshipbetween ground level enhancement and solar flare, J. Geophys. Res., 116, A04101.
Gopalswamy N., Xie H., Yashiro S., Akiyama S., Mialeka P., Usoskin I. G. (2012), Space Science Reviews, 171, 23.
Forbush, S. E. (1946), Three unusual cosmic ray increases possibly due to charged particles from the sun, Phys. Rev., 70, 771-772.
Gopalswamy, N., Xie, H., Akiyama, S,, Yashiro, S,, Usoskin, I, G., and Davila, J. M. (2013), The first ground level enhancement event of solar cycle 24: direct observation of shock formation and particle release heights. Astrophisical Jornal, 765: L30-L34.
Gopalswamy, N., Xie, H., Yashiro, S., Akiyama, S., Mialeka, P., and Usoskin, I. G. (2012), Properties of Ground Level Enhancement Events and the Associated Solar Eruptions during Solar Cycle 23. Space Science Reviews, 171, 23.
Kataoka R., Sato T., Hiroshi Y., (2010), Predicting radiation dose on aircraft from space energetic particles, Space Weather, 9, S08004.
Kudela, K., M. A. Shea, D. F. Smart, and L. C. Gentile (1993), Relativisticsolar particle events recorded by the Lomnicky Stit neutron monitor, paper presented at 23rd International Cosmic Ray Conference, Int. Unionof Pure and Appl. Phys., Calgary, Alberta, Canada.
Liu, C., Ungar, K. Zhang, W., Korpach, E.; Benotto, M., Pellerin, E,, (2019), Observation of Ground-level Enhancement Across Canada’s Fixed Point Surveillance Network During the 20 January 2005 Solar Event, Health Physics 117 (3), 291-299.
Mishev, A. L., L. G. Kocharov, and I. G. Usoskin (2014), Analysis of the ground level enhancement on 17May 2012 using data from the global neutron monitor network, J. Geo- phys. Res. Space Physics, 119 670–679.
Mishev, A. Adibpour F., Usoskin I. G., Felsberger E., (2015), Computation of dose rate at flight altitudes during groundlevel enhancements no. 69, 70 and 71, Advances in Space Research, 55, 354–362.
Reames D. V. (1999), Particle acceleration at the sun and in the heliosphere, Space Science Reviews, 90, 413-491.
Smart D. F., Shea M. A., Taskanen P. J. I. (1971), A determination of the spectra spetial anisotropy and propagation characteristics of the relativistic Solar Cosmic Ray flux on Nov. 18, 1969, In Proceeding of 12th International Cosmic Ray Conference, 2, 483-488.
Storini M., Kudela K., Cordaro E. G., and Massetti S., (2005), Ground Level Enhancement during Solar Cycles 23, Results from SVIRCO, LOMNICKY STIT and LARC Neutron monitors, Advances in Space Research, 35, 416-420.
Usoskin I. G. Dosorgher L., Velinov P., et al (2009), Ionization of the Earth’s atmospheric by solar and galactic cosmic rays, Acta Geophysica, 57 (1), 88-101.
Uddin, W., R. Chandra, and Ali, S. S. (2006), Extremely energetic 4BX17.2 flare and associated phenomena, Journal of Astrophys. Astron. 27 (2-3), 267-276.
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