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Measurements of the Heavy-Ion Elemental and Isotopic Composition in Large Solar Particle Events from ACE

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
Related URLs:
URLURL TypeDescription
http://www.aspbooks.org/a/volumes/table_of_contents/?book_id=318PublisherArticle
http://adsabs.harvard.edu/abs/2000ASPC..206..118LADSArticle
ORCID:
AuthorORCID
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Cohen, C. M. S.0000-0002-0978-8127
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
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.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANAG5-6912
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1999-17
Series Name:ASP Conference Series Proceedings
Issue or Number:206
Record Number:CaltechAUTHORS:20140826-071624732
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140826-071624732
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
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48881
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:26 Aug 2014 17:10
Last Modified:20 Feb 2020 14:33

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