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Measurements of Heavy Elements and Isotopes in Small Solar Energetic Particle Events

Slocum, P. L. and Christian, E. R. and Cohen, C. M. S. and Cummings, A. C. and Leske, R. A. and Mewaldt, R. A. and Stone, E. C. and von Rosenvinge, T. T. and Wiedenbeck, M. E. (2001) Measurements of Heavy Elements and Isotopes in Small Solar Energetic Particle Events. In: Solar and Galtic Composition. AIP Conference Proceedings. No.598. American Institute of Physics , Melville, NY, pp. 177-182. ISBN 0-7354-0042-3.

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Using the Solar Isotope Spectrometer on the Advanced Composition Explorer, we have examined the ~10–20 MeV/nucleon elemental and isotopic composition of heavy (Z≥6) energetic nuclei accelerated in 30 small solar energetic particle (SEP) events which occurred between 31 March 1998 and 2 January 2001. We have measured the average heavy element content, the ^(22)Ne/^(20)Ne ratio, and the ^(26)Mg/^(24)Mg ratio in these events, and find good agreement with past studies. We have categorized the events according to their 3He/4He ratios, and find significant enhancements in the neutron-rich heavy isotopes of Ne and Mg in the combined 3He-rich data set: ^(22)Ne/^(20)Ne = 0.17±0.05 and ^(26)Mg/^(24)Mg = 0.25±0.05. We discuss the implications of these measurements for the acceleration of energetic nuclei in SEP events.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Christian, E. R.0000-0003-2134-3937
Cohen, C. M. S.0000-0002-0978-8127
Cummings, A. C.0000-0002-3840-7696
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:© 2001 American Institute of Physics. Issue Date: 21 November 2001. This research was supported by NASA at Caltech (under grant NAG5-6912), JPL, and GSFC. We thank the EPAM science team for providing the proton fluxes used to define the time periods of low solar activity in this paper.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Goddard Space Flight CenterUNSPECIFIED
Subject Keywords:solar cosmic ray particles; energy measurement; element relative abundance; isotope relative abundance; time series; neon; acceleration
Series Name:AIP Conference Proceedings
Issue or Number:598
Classification Code:PACS: 96.60.Vg; 96.60.Fs; 95.75.Wx
Record Number:CaltechAUTHORS:20111117-123441068
Persistent URL:
Official Citation:Measurements of heavy elements and isotopes in small solar energetic particle events P. L. Slocum, E. R. Christian, C. M. S. Cohen, A. C. Cummings, R. A. Leske, R. A. Mewaldt, E. C. Stone, T. T. von Rosenvinge, and M. E. Wiedenbeck, AIP Conf. Proc. 598, 177 (2001), DOI:10.1063/1.1433997
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27836
Deposited By: Jason Perez
Deposited On:17 Nov 2011 22:20
Last Modified:09 Nov 2021 16:52

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