Leske, R. A. and Mewaldt, R. A. and Cohen, C. M. S. and Cummings, A. C. and Stone, E. C.
(2000)
Measurements of the Heavy-Ion Elemental and Isotopic Composition in Large Solar Particle Events from ACE.
In:
High Energy Solar Physics - Anticipating HESSI.
ASP Conference Series Proceedings.
No.206.
Astronomical Society of the Pacific
, San Francisco, CA, pp. 118-123.
ISBN 1-58381-033-1.
https://resolver.caltech.edu/CaltechAUTHORS:20140826-071624732
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Abstract
Using the Solar Isotope Spectrometer (SIS) on the Advanced
Composition Explorer (ACE), we have measured the isotopic composition of as many as eleven elements from He through Ni at energies of tens of MeV /nucleon in eleven solar energetic particle (SEP) events that have occurred since November 1997. We find that isotopic composition varies dramatically from event to event. For example, the ^(22)Ne/^(20)Ne ratio ranges from ~ 0. 7 to > 2 times the solar wind value, being lowest for iron-poor events and highest for iron-rich events. We present the SIS SEP isotope measurements to date and show that the strong correlation of elemental and isotopic abundance ratios suggests that elemental and isotopic fractionation are governed by the same process.
| Item Type: | Book Section |
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| Additional Information: | © 2000 Astronomical Society of the Pacific. 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. |
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| Group: | Space Radiation Laboratory |
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| Funders: | | Funding Agency | Grant Number |
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| NASA | NAG5-6912 |
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| Other Numbering System: | | Other Numbering System Name | Other Numbering System ID |
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| Space Radiation Laboratory | 1999-17 |
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| Series Name: | ASP Conference Series Proceedings |
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| Issue or Number: | 206 |
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| Record Number: | CaltechAUTHORS:20140826-071624732 |
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| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140826-071624732 |
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| Official Citation: | Measurements of the Heavy-Ion Elemental and Isotopic Composition in Large Solar Particle Events from ACE
206, High Energy Solar Physics - Anticipating HESSI
Leske, R. A.; Mewaldt, R. A.; Cohen, C. M. S.; Cummings, A. C.; Slocum, P. L.; Wiedenbeck, M. E.; Christian, E. R.; von Rosenvinge, T. T.
Pages:118-123 |
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| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
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| ID Code: | 48881 |
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| Collection: | CaltechAUTHORS |
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| Deposited By: |
Ruth Sustaita
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| Deposited On: | 26 Aug 2014 17:10 |
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| Last Modified: | 20 Feb 2020 14:33 |
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