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Mass Fractionation in Solar Energetic Particles and the Isotopic Composition of the Corona

Leske, R. A. and Mewaldt, R. A. and Cohen, C. M. S. and Christian, E. R. and Cummings, A. C. and Slocum, P. L. and Stone, E. C. and von Rosenvinge, T. T. and Wiedenbeck, M. E. (2001) Mass Fractionation in Solar Energetic Particles and the Isotopic Composition of the Corona. In: Proceedings of the 27th International Cosmic Ray Conference. Vol.8. Copernicus Systems and Technology GmbH , Berlin, Germany, pp. 3142-3145.

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Using the Solar Isotope Spectrometer on the Advanced Composition Explorer, the isotopic composition of solar energetic particles (SEPs) has been measured in 18 large SEP events for abundant elements from C through Ni at energies of tens of Me V /nucleon. Although SEP isotopic composition is found to vary widely from event to event, it is strongly correlated with the elemental composition, suggesting that elemental and isotopic fractionation relative to the coronal source are largely governed by the same processes. Using empirical correlations to correct for the fractionation yields preliminary coronal isotopic abundance values in good agreement with those found in the solar wind, with comparable accuracy.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Cohen, C. M. S.0000-0002-0978-8127
Christian, E. R.0000-0003-2134-3937
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:© Copernicus GmbH. This research was supported by NASA at the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, and the Goddard Space Flight Center.
Group:Space Radiation Laboratory
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Space Radiation Laboratory2001-44
Record Number:CaltechAUTHORS:20150303-102937851
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55460
Deposited By: Deborah Miles
Deposited On:05 Mar 2015 01:01
Last Modified:09 Mar 2020 13:19

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