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

Leske R. A. | Zendy; Cohen C. M. S. | Zendy; Cummings A. C. | Zendy; Mewaldt R. A. | Zendy; Stone E. C. | Zendy; Dougherty B. L. | Zendy; Wiedenbeck M. E. | Zendy; Christian E. R. | Zendy; von Rosenvinge T. T. | Zendy

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

Author(s) -

Leske R. A.,

Cohen C. M. S.,

Cummings A. C.,

Mewaldt R. A.,

Stone E. C.,

Dougherty B. L.,

Wiedenbeck M. E.,

Christian E. R.,

von Rosenvinge T. T.

Publication year - 1999

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/1998gl900173

Subject(s) - isotope , solar energetic particles , physics , analytical chemistry (journal) , nuclear physics , chemistry , solar wind , environmental chemistry , coronal mass ejection , plasma

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.

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