Publication: Relativistic particle injection and interplanetary transport during the January 20, 2005 ground level enhancement
Issued Date
2005-01-01
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2-s2.0-84898992415
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Mahidol University
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SCOPUS
Bibliographic Citation
29th International Cosmic Ray Conference, ICRC 2005. Vol.1, (2005), 229-232
Suggested Citation
Alejandro Sáiz, David Ruffolo, Manit Rujiwarodom, John W. Bieber, John Clem, Paul Evenson, Roger Pyle, Marc L. Duldig, John E. Humble Relativistic particle injection and interplanetary transport during the January 20, 2005 ground level enhancement. 29th International Cosmic Ray Conference, ICRC 2005. Vol.1, (2005), 229-232. Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/17190
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Title
Relativistic particle injection and interplanetary transport during the January 20, 2005 ground level enhancement
Abstract
Besides producing the largest ground level enhancement (GLE) in half a century, the relativistic solar particles detected during the event of January 20, 2005 showed some interesting temporal and directional features, including extreme anisotropy. In this paper we analyze the time evolution of cosmic ray density and anisotropy as characterized by data from the "Spaceship Earth" network of neutron monitors by using numerical solutions of the Fokker-Planck equation for particle transport. We find that a sudden change in the transport conditions during the event is needed to explain the data, and we propose that this change was caused by the solar particles themselves.