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Unusual isotopic composition of solar energetic particles observed in the November 6, 1997 event

Leske, R. A. and Cohen, C. M. S. and Cummings, A. C. and Mewaldt, R. A. and Stone, E. C. and Dougherty, B. L. and Wiedenbeck, M. E. and Christian, E. R. and von Rosenvinge, T. T. (1999) Unusual isotopic composition of solar energetic particles observed in the November 6, 1997 event. Geophysical Research Letters, 26 (2). pp. 153-156. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20140827-113048212

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Abstract

Using the Solar Isotope Spectrometer on the Advanced Composition Explorer, we have measured the isotopic composition of solar energetic particles (SEPs) with energies of tens of MeV/nucleon during the November 6, 1997 solar event, including isotopes never before reported in SEPs, such as ^(34)S, ^(38)Ar, ^(44)Ca, ^(54)Fe, and ^(60)Ni, as well as isotopes of C, N, O, Ne, Mg, and Si. Abundances are found to be enhanced by factors of ∼2 relative to the standard solar system values for ^(22)Ne/^(20)Ne and ^(26)Mg/^(24)Mg. Overall, the enrichments of the isotope ratios show a correlation with the ratio of masses, M_2/M_1, scaling approximately as (M_2/M_1)^7, although significant deviations from this trend are evident.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/1998GL900173DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/1998GL900173/abstractPublisherArticle
ORCID:
AuthorORCID
Cohen, C. M. S.0000-0002-0978-8127
Additional Information:© 1998 by the American Geophysical Union. Received September 9, 1998; accepted October 2, 1998. Paper number 1998GL900173. 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. We are grateful to the large group of dedicated and talented individuals who made the ACE mission possible and contributed to the development of the SIS instrument (as acknowledged in Stone et al., (1998]).
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 Laboratory1998-04
Record Number:CaltechAUTHORS:20140827-113048212
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140827-113048212
Official Citation:Unusual isotopic composition of solar energetic particles observed in the November 6, 1997 event (pages 153–156) R. A. Leske, C. M. S. Cohen, A. C. Cummings, R. A. Mewaldt, E. C. Stone, B. L. Dougherty, M. E. Wiedenbeck, E. R. Christian and T. T. von Rosenvinge DOI: 10.1029/1998GL900173
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48989
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:27 Aug 2014 19:53
Last Modified:13 Sep 2017 16:01

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