Publication: Relativistic solar neutrons and protons on 28 October 2003
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Issued Date
2005-02-16
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ISSN
00948276
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2-s2.0-17744387711
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Mahidol University
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SCOPUS
Bibliographic Citation
Geophysical Research Letters. Vol.32, No.3 (2005), 1-5
Suggested Citation
John W. Bieber, John Clem, Paul Evenson, Roger Pyle, David Ruffolo, Alejandro Sáiz Relativistic solar neutrons and protons on 28 October 2003. Geophysical Research Letters. Vol.32, No.3 (2005), 1-5. doi:10.1029/2004GL021492 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/16493
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Title
Relativistic solar neutrons and protons on 28 October 2003
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Abstract
The solar cosmic ray event associated with the X17.2 class flare of 28 October 2003 was unusual in several respects: (1) Several high-latitude neutron monitors observed a large, highly anisotropic spike at event onset. (2) The earliest onset was detected by stations viewing towards the anti-Sunward hemisphere. (3) The event displayed an extremely slow, protracted decay. (4) The near-equatorial monitor in Tsumeb, Africa recorded a small increase consistent with a solar neutron event ≈7 minutes prior to the onset at high latitudes. We analyze these signals and infer that relativistic solar neutrons were emitted over a duration of ≈9 minutes, starting ≈7 minutes before the main injection of relativistic protons. Copyright 2005 by the American Geophysical Union.