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Ultra-Heavy Elements Above 10 MeV/nucleon in Solar Energetic Particle Events

Leske, R. A. and Cohen, C. M. S. and Cummings, A. C. and Mewaldt, R. A. and Stone, E. C. and Wiedenbeck, M. E. and von Rosenvinge, T. T. (2005) Ultra-Heavy Elements Above 10 MeV/nucleon in Solar Energetic Particle Events. In: Proceedings of the 29th International Cosmic Ray Conference. Vol.1. Tata Institute of Fundamental Research , Mumbai, India, pp. 107-110.

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Recent measurements from Wind/LEMT and ACE/ULEIS show that elements heavier than Zn (Z=30) can be enhanced by factors of ~100 to 10,000 in impulsive solar energetic particle (SEP) events at energies below several MeV/nuc. Using data from the Solar Isotope Spectrometer (SIS) on ACE at energies from ~10 to >100 MeV/nuc, we find that even large gradual events at these energies often are very iron rich and may appear similar in composition to impulsive events. Since August 1997, SIS has recorded ~1000 nuclei with Z of 29 or greater, including measurable quantities of Zn, Ge and Se (Z=30, 32, and 34). Although quantitative analysis to obtain ultra-heavy abundances remains to be done, we present sample observations that establish the potential of extending ultra-heavy SEP measurements up to higher energies in order to test models of acceleration and abundance enhancements in both gradual and impulsive events.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Leske, R. A.0000-0002-0156-2414
Cohen, C. M. S.0000-0002-0978-8127
Cummings, A. C.0000-0002-3840-7696
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:© 2005 Tata Institute of Fundamental Research. This work was supported by NASA at Caltech (under grant NAG5-6912), JPL, and GSFC.
Group:Space Radiation Laboratory
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Goddard Space Flight CenterUNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2005-13
Record Number:CaltechAUTHORS:20140827-135634611
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48998
Deposited By: Tony Diaz
Deposited On:03 Sep 2014 14:22
Last Modified:09 Mar 2020 13:19

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