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Ionic Charge States Inferred from Elemental and Isotopic Composition in ^3He-rich Solar Energetic Particle Events

Wiedenbeck, M. E. and Cohen, C. M. S. and Leske, R. A. and Mewaldt, R. A. and Cummings, A. C. and Stone, E. C. and von Rosenvinge, T. T. (2009) Ionic Charge States Inferred from Elemental and Isotopic Composition in ^3He-rich Solar Energetic Particle Events. In: Proceedings of the 31st International Cosmic Ray Conference. , Lodz, Poland, pp. 1-5.

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Data from the ACE Solar Isotope Spectrometer have been used to study heavy ion elemental and isotopic abundances at energies above 10MeV/nuc in a number of ^3He-rich solar energetic particle events. The isotopic composition observations have revealed a fractionation pattern in which heavy isotopes are enhanced relative to lighter isotopes of the same element as a power law in the ratio of the masses. Adopting the assumption that this represents a special case of a general fractionation law in which different ion species are fractionated as a power law in Q/M , we infer ionic charge state values (Q) for a number of elements and compare them with direct measurements, when available. The relationship between these Q values and the observed elemental fractionation patterns are discussed.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Wiedenbeck, M. E.0000-0002-2825-3128
Cohen, C. M. S.0000-0002-0978-8127
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Additional Information:Copyright University of Łódź. Department of High Energy Astrophysics, 2010 We thank Dr. J. Mazur for providing preliminary SAMPEX/LICA charge state measurements for the 20 Aug 2002 event. This work was supported by NASA at Caltech (under grant NX8AI11G), JPL, and GSFC.
Group:Space Radiation Laboratory
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Space Radiation Laboratory2009-13
Record Number:CaltechAUTHORS:20150512-092059942
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57437
Deposited By: Deborah Miles
Deposited On:13 May 2015 13:54
Last Modified:09 Mar 2020 13:19

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