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The Coronal Isotopic Composition as Determined Using Solar Energetic Particles

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. (2003) The Coronal Isotopic Composition as Determined Using Solar Energetic Particles. In: Solar Wind Ten. AIP Conference Proceedings. No.679. American Institute of Physics , Melville, NY, pp. 616-619. ISBN 0-7354-0148-9

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Solar energetic particles (SEPs), like the solar wind, provide a direct sample of the Sun. Although SEP abundances show a variable amount of mass fractionation, it is possible to develop methods of correcting for it in order to deduce the composition of the corona. Using high-resolution measurements from the Solar Isotope Spectrometer on the Advanced Composition Explorer, we have studied the isotopic composition of 10 abundant elements from C to Ni in 32 large SEP events from late 1997 to the end of 2001 at energies >15 MeV/nucleon. We show that various isotopic and elemental enhancements are correlated with each other, discuss the first order corrections used to account for the variability, and obtain estimated coronal abundances. We compare the coronal values and their uncertainties inferred from SEPs with those that are available from solar wind and meteoritic measurements and find generally good agreement. We include C and Ni isotopic abundances, for which no solar wind measurements have yet been reported.

Item Type:Book Section
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Additional Information:© 2003 American Institute of Physics. Issue Date: 2 September 2003. This work was supported by NASA at the California Institute of Technology (grant NAG5-6912), the Jet Propulsion Laboratory, and the Goddard Space Flight Center.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Goddard Space Flight CenterUNSPECIFIED
Subject Keywords:solar corona, isotopes, solar wind
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2003-57
Classification Code:PACS: 96.60.Vg; 96.60.Pb; 96.40.Fg; 96.60.Fs; 96.50.Ci
Record Number:CaltechAUTHORS:20111010-143811077
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Official Citation:The Coronal Isotopic Composition as Determined Using Solar Energetic Particles R. A. Leske, R. A. Mewaldt, C. M. S. Cohen, E. R. Christian, A. C. Cummings, P. L. Slocum, E. C. Stone, T. T. von Rosenvinge, and M. E. Wiedenbeck, AIP Conf. Proc. 679, 616 (2003), DOI:10.1063/1.1618670
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27145
Deposited By: Tony Diaz
Deposited On:11 Oct 2011 20:22
Last Modified:19 Mar 2015 20:33

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