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Isotopic Abundances in the Solar Corona as Inferred from ACE Measurements of 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. (2001) Isotopic Abundances in the Solar Corona as Inferred from ACE Measurements of Solar Energetic Particles. In: Solar and Galactic Composition. AIP Conference Proceedings. No.598. American Institute of Physics , Melville, N.Y., pp. 127-132. ISBN 0-7354-0042-3.

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The isotopic composition of solar energetic particles (SEPs) has been measured using the Solar Isotope Spectrometer on the Advanced Composition Explorer. The measurements include up to 12 isotope abundance ratios for ten elements from C through Ni at energies of tens of MeV/nucleon in 18 large SEP events that have occurred since November 1997. These measurements clearly establish that SEP isotopic composition can vary widely (by factors of >3) from event to event, presumably due to mass fractionation processes during particle acceleration and/or transport. Elemental and isotopic abundance ratios are strongly correlated, 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 and obtain the coronal isotopic composition yields preliminary 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:© 2001 American Institute of Physics. Issue Date: 21 November 2001. 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
Funding AgencyGrant Number
Goddard Space Flight CenterUNSPECIFIED
Subject Keywords:solar corona, solar wind, isotope relative abundance, element relative abundance, astronomical instruments, time series
Series Name:AIP Conference Proceedings
Issue or Number:598
Classification Code:PACS: 96.60.Fs; 96.60.Vg; 95.55.Ev
Record Number:CaltechAUTHORS:20111118-094513677
Persistent URL:
Official Citation:Isotopic abundances in the solar corona as inferred from ACE measurements of 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. 598, 127 (2001), DOI:10.1063/1.1433990
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27850
Deposited By: Ruth Sustaita
Deposited On:21 Nov 2011 16:29
Last Modified:09 Nov 2021 16:52

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