A Study of ^3He Spectra and Abundances in Impulsive Solar Energetic Particle Events - Results from Measurements with ACE/SEPICA, ACE/SIS and SOHO/HSTOF
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Abstract
Energy spectra of the He isotopes and the energy dependence of the ^3He/^4He ratio during a number of impulsive solar energetic particle events (SEP) observed between September 1997 and December 1998 are analyzed. Data covering the energy range from 0.1 to 10 MeV/amu were supplied by three instruments with complementary energy ranges: the Solar Energetic Particle Ionic Charge Analyzer (SEPICA) and the Solar Isotope Spectrometer (SIS) on ACE, and the time-of-flight mass spectrometer HSTOF on SOHO. We confirm the trend of a monotonic increase of the 3He abundance with energy up to a maximum in the region of a few MeV/amu found in previous ISEE studies and extend the analysis to events of intermediate 3He enrichment. We briefly discuss the observational data and their relation to existing theoretical work on selection and acceleration mechanisms in impulsive flares.
Additional Information
© University of Utah. Provided by the NASA Astrophysics Data System. The authors would like to acknowdge the unnamed contribution of numerous individuals at the Institutions appearing in the author list without whose effort this work would not have been possible. The work on the SEPICA instrument was supported by NASA under contract NAS5-32626.Attached Files
Published - 1999-18.pdf
Files
1999-18.pdf
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- Eprint ID
- 54500
- Resolver ID
- CaltechAUTHORS:20150206-150809671
Related works
- Describes
- http://adsabs.harvard.edu/full/1999ICRC....6..179B (URL)
Funding
- NASA
- NAS5-32626
Dates
- Created
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2015-02-25Created from EPrint's datestamp field
- Updated
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2020-03-09Created from EPrint's last_modified field
Caltech Custom Metadata
- Caltech groups
- Space Radiation Laboratory , Physics Department
- Other Numbering System Name
- Space Radiation Laboratory
- Other Numbering System Identifier
- 1999-18