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. https://resolver.caltech.edu/CaltechAUTHORS:20111118-094513677
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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.
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| 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 | |||||||||
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| 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: | https://resolver.caltech.edu/CaltechAUTHORS:20111118-094513677 | |||||||||
| 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 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Ruth Sustaita | |||||||||
| Deposited On: | 21 Nov 2011 16:29 | |||||||||
| Last Modified: | 22 Nov 2019 09:58 |
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