Measurements of the Heavy-Ion Elemental and Isotopic Composition in Large Solar Particle Events from ACE
Abstract
Using the Solar Isotope Spectrometer (SIS) on the Advanced Composition Explorer (ACE), we have measured the isotopic composition of as many as eleven elements from He through Ni at energies of tens of MeV /nucleon in eleven solar energetic particle (SEP) events that have occurred since November 1997. We find that 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, being lowest for iron-poor events and highest for iron-rich events. We present the SIS SEP isotope measurements to date and show that the strong correlation of elemental and isotopic abundance ratios suggests that elemental and isotopic fractionation are governed by the same process.
Additional Information
© 2000 Astronomical Society of the Pacific. 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
Published - Stone_2000p118.pdf
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Additional details
- Eprint ID
- 48881
- Resolver ID
- CaltechAUTHORS:20140826-071624732
- NASA
- NAG5-6912
- Created
-
2014-08-26Created from EPrint's datestamp field
- Updated
-
2020-02-20Created from EPrint's last_modified field
- Caltech groups
- Space Radiation Laboratory
- Series Name
- ASP Conference Series Proceedings
- Series Volume or Issue Number
- 206
- Other Numbering System Name
- Space Radiation Laboratory
- Other Numbering System Identifier
- 1999-17