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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, NY, pp. 127-132. ISBN 0-7354-0042-3. http://resolver.caltech.edu/CaltechAUTHORS:20140826-103636832

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Abstract

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
http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.1433990PublisherArticle
http://dx.doi.org/10.1063/1.1433990DOIArticle
ORCID:
AuthorORCID
Cohen, C. M. S.0000-0002-0978-8127
Additional Information:© 2001 American Institute of Physics. Published online 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
Funders:
Funding AgencyGrant Number
NASANAG5-6912
JPLUNSPECIFIED
Goddard Space Flight CenterUNSPECIFIED
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2003-25
Record Number:CaltechAUTHORS:20140826-103636832
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140826-103636832
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); http://dx.doi.org/10.1063/1.1433990
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48905
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:26 Aug 2014 20:01
Last Modified:12 Sep 2017 23:21

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