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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. doi:10.1029/1998GL900173.

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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
Leske, R. A.0000-0002-0156-2414
Cohen, C. M. S.0000-0002-0978-8127
Cummings, A. C.0000-0002-3840-7696
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Christian, E. R.0000-0003-2134-3937
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
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Goddard Space Flight CenterUNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1998-04
Issue or Number:2
Record Number:CaltechAUTHORS:20140827-113048212
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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
Deposited By: Ruth Sustaita
Deposited On:27 Aug 2014 19:53
Last Modified:10 Nov 2021 18:38

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