Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh62b01l&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH62B-01
Physics
2118 Energetic Particles, Solar, 7514 Energetic Particles (2114)
Scientific paper
Solar energetic particles (SEPs) can be used to probe the elemental and isotopic composition of the solar corona, independent of spectroscopic or solar wind measurements. Recent results from the Advanced Composition Explorer (ACE), however, have clearly established that SEP isotopic composition varies widely (by factors of >3) from event to event, apparently due to mass fractionation processes during the acceleration and/or transport of these particles. This variation must be taken into account when using SEP measurements to deduce the coronal composition. In the >3 years since the launch of ACE, we have obtained SEP isotope measurements of abundant elements from C to Ni in ~ 16-18 large SEP events. In this report, we show that the isotopic and elemental abundance enhancements are strongly correlated, and we discuss the corrections needed to obtain coronal abundances. We compare the inferred coronal values and their uncertainties with those derived from solar wind measurements and find generally good agreement. This work was supported by NASA at Caltech (under grant NAG5-6912), JPL, and GSFC.
Christian Eric R.
Cohen M. C.
Cummings Alan C.
Leske Richard A.
Mewaldt Richard A.
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