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Onsets and Release Times in Solar Particle Events

Tylka, A. J. and Cohen, C. M. S. and Dietrich, W. F. and Krucker, S. and McGuire, R. E. and Mewaldt, R. A. and Ng, C. K. and Reames, D. V. and Share, G. H. (2003) Onsets and Release Times in Solar Particle Events. In: Proceedings of the 28th International Cosmic Ray Conference. Vol.6. International Union of Applied Physics , Tokyo, Japan, pp. 3305-3308.

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The time at which solar energetic particles (SEPs) are first released into interplanetary space, and its relation to CMEs and various photon emissions, are important clues to the site and nature of the SEP acceleration mechanism [1- 5,7,8,10,11]. We examine velocity dispersion among onsets in electrons and ions from Wind, ACE, and IMPB, as well as available neutron monitors, to determine the solar release time. We present results for two large impulsive events (1 May 2000 and 14 April 2001) and three western ground level events (GLEs; 6 November 1997, 6 May 1998, and 15 April 2001). In the impulsive events, the particle release coincides with hard x-ray emission. But the large GLEs show delayed release with respect to 1-ray emission, consistent with acceleration by the CME-driven shock.

Item Type:Book Section
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URLURL TypeDescription
Cohen, C. M. S.0000-0002-0978-8127
Mewaldt, R. A.0000-0003-2178-9111
Additional Information:Copyright Universal Academy Press Inc. We thank K. Hurley, C. Lopate, R. Pyle, I. Usoskin, and E. Vashenyuk for data. AJT supported by NASA DPR S-13791G and the Office of Naval Research.
Group:Space Radiation Laboratory
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Office of Naval Research (ONR)UNSPECIFIED
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Space Radiation Laboratory2003-13
Record Number:CaltechAUTHORS:20150403-100248724
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56340
Deposited By: Deborah Miles
Deposited On:05 Apr 2015 23:32
Last Modified:22 Nov 2019 09:58

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