Published 1999
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Measurements of the Heavy-Ion Isotopic Composition of Solar Energetic Particles
Chicago
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Abstract
Using the Solar Isotope Spectrometer (SIS) on the Advanced Composition Explorer (ACE) spacecraft, we have measured the isotopic composition of ten elements from C to Ni (Z = 6 to 28) at energies of tens of MeV/nucleon in as many as nine solar energetic particle (SEP) events that have occurred since November 1997. We find that the isotopic composition varies dramatically from event to event. For example, the ^(22)Ne/^(20)Ne ratio ranges from ~0.7 to 2 times the solar wind value. The mass fractionation is strongly correlated with the Fe/O and other element abundance ratios, suggesting that the elemental and isotopic fractionation are governed by the same process.
Additional Information
© University of Utah. Provided by the NASA Astrophysics Data System 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.Attached Files
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- Eprint ID
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- CaltechAUTHORS:20150212-094216395
- NASA
- NAG5-6912
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2015-02-13Created from EPrint's datestamp field
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2020-03-09Created from EPrint's last_modified field
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- Space Radiation Laboratory