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A Study of ^3He Spectra and Abundances in Impulsive Solar Energetic Particle Events - Results from Measurements with ACE/SEPICA, ACE/SIS and SOHO/HSTOF

Bogdanov, A. T. and Möbius, E. and Klecker, B. and Hilchenback, M. and Hovestadt, D. and Kistler, L. M. and Popecki, M. A. and Lund, E. J. and Heirtzler, D. and Galvin, A. B. and Cohen, C. M. S. and Cummings, A. C. and Leske, R. A. and Mewaldt, R. A. and Stone, E. C. and Slocum, P. L. and Wiedenbeck, M. E. and Christian, E. R. and von Rosenvinge, T. T. (1999) A Study of ^3He Spectra and Abundances in Impulsive Solar Energetic Particle Events - Results from Measurements with ACE/SEPICA, ACE/SIS and SOHO/HSTOF. In: Proceedings of the 26th International Cosmic Ray Conference. Vol.6. International Union of Pure and Applied Physics , pp. 179-183.

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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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Galvin, A. B.0000-0003-3752-5700
Cohen, C. M. S.0000-0002-0978-8127
Cummings, A. C.0000-0002-3840-7696
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
Christian, E. R.0000-0003-2134-3937
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.
Group:Space Radiation Laboratory
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Space Radiation Laboratory1999-18
Record Number:CaltechAUTHORS:20150206-150809671
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54500
Deposited By: Deborah Miles
Deposited On:25 Feb 2015 19:39
Last Modified:09 Mar 2020 13:19

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