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Solar Isotopic Composition as Determined Using Solar Energetic Particles

Leske, R. A. and Mewaldt, R. A. and Cohen, C. M. S. and Cummings, A. C. and Stone, E. C. and Wiedenbeck, M. E. and von Rosenvinge, T. T. (2007) Solar Isotopic Composition as Determined Using Solar Energetic Particles. In: The Composition of Matter. Space Science Series of ISSI. No.27. Springer New York , New York, NY, pp. 195-205. ISBN 9780387741833.

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Solar energetic particles (SEPs) provide a sample of the Sun from which solar composition may be determined. Using high-resolution measurements from the Solar Isotope Spectrometer (SIS) onboard NASA’s Advanced Composition Explorer (ACE) spacecraft, we have studied the isotopic composition of SEPs at energies ≥20 MeV/nucleon in large SEP events. We present SEP isotope measurements of C, O, Ne, Mg, Si, S, Ar, Ca, Fe, and Ni made in 49 large events from late 1997 to the present. The isotopic composition is highly variable from one SEP event to another due to variations in seed particle composition or due to mass fractionation that occurs during the acceleration and/or transport of these particles. We show that various isotopic and elemental enhancements are correlated with each other, discuss the empirical corrections used to account for the compositional variability, and obtain estimated solar isotopic abundances. We compare the solar values and their uncertainties inferred from SEPs with solar wind and other solar system abundances and find generally good agreement.

Item Type:Book Section
Related URLs:
URLURL TypeDescription ItemJournal Article
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Cohen, C. M. S.0000-0002-0978-8127
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Additional Information:© Springer Science+Business Media, LLC 2007. Received: 2 February 2007 / Accepted: 3 April 2007 / Published online: 25 May 2007. This work was supported by NASA at the California Institute of Technology (grant NAG5-12929), the Jet Propulsion Laboratory, and the Goddard Space Flight Center.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Goddard Space Flight CenterUNSPECIFIED
Subject Keywords:Sun: abundances; Sun: particle emission ;Sun: coronal mass ejections (CMEs); Sun: flares
Series Name:Space Science Series of ISSI
Issue or Number:27
Record Number:CaltechAUTHORS:20190909-133030848
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98519
Deposited By: George Porter
Deposited On:09 Sep 2019 21:02
Last Modified:16 Nov 2021 17:39

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