Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprk12006l&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
Using the Solar Isotope Spectrometer on the Advanced Composition Explorer (ACE) spacecraft, we have measured the isotopic composition of solar energetic particles (SEPs) in large SEP events. A high degree of mass fractionation occurs during the acceleration and/or transport of these particles, but it is possible to discern patterns in the fractionation and thereby correct for it in order to deduce the source composition of the corona. We present SEP isotope measurements of 10 abundant elements from C to Ni made in more than 30 large events from late 1997 to the present. We show that various isotopic and elemental enhancements are correlated with each other, discuss the corrections used to account for the variability, and obtain estimated coronal abundances. We compare the coronal values and their uncertainties inferred from SEPs with those available from solar wind and meteoritic measurements and find generally good agreement.
Christian Eric R.
Cohen Christina Mae S.
Cummings Alan C.
Leske Richard A.
Mewaldt Richard A.
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