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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. Space Science Reviews, 130 (1-4). pp. 195-205. ISSN 0038-6308. doi:10.1007/s11214-007-9185-3.

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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:Article
Related URLs:
URLURL TypeDescription DOIArticle ReadCube access ItemBook Chapter
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, Inc. 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
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2007-17
Issue or Number:1-4
Record Number:CaltechAUTHORS:20100503-093124629
Persistent URL:
Official Citation:Leske, R.A., Mewaldt, R.A., Cohen, C.M.S. et al. Space Sci Rev (2007) 130: 195.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18096
Deposited By: Tony Diaz
Deposited On:05 May 2010 03:31
Last Modified:08 Nov 2021 23:41

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