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The heavy-ion compositional signature in He-3-rich solar particle eventsA survey of the approx. 1 MeV/nucleon heavy ion abundances in 66 He-3-rich solar particle events was performed using the Max-Planck-Institut/University of Maryland and Goddard Space Flight Center instruments on the ISEE-3 spacecraft. The observations were carried out in interplanetary space over the period 1978 October through 1982 June. Earlier observations were confirmed which show an enrichment of heavy ions in He-3-rich events, relative to the average solar energetic particle composition in large particle events. For the survey near 1.5 MeV/nucleon the enrichments compared to large solar particle events are approximately He4:C:O:Ne:Mg:Si:Fe = 0.44:0.66:1.:3.4:3.5:4.1:9.6. Surprising new results emerging from the present broad survey are that the heavy ion enrichment pattern is the same within a factor of approx. 2 for almost all cases, and the degree of heavy ion enrichment is uncorrelated with the He-3 enrichment. Overall, the features established appear to be best explained by an acceleration mechanism in which the He-3 enrichment process is not responsible for the heavy ion enrichment, but rather the heavy ion enrichment is a measure of the ambient coronal composition at the sites where the He-3-rich events occur.
Document ID
19860051046
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Mason, G. M.
(Maryland, University College Park, United States)
Reames, D. V.
(Maryland Univ. College Park, MD, United States)
Von Rosenvinge, T. T.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Klecker, B.
(Maryland Univ. College Park, MD, United States)
Hovestadt, D.
(Max-Planck-Institut fuer Physik und Astrophysik Garching, Germany)
Date Acquired
August 12, 2013
Publication Date
April 15, 1986
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 303
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
86A35784
Funding Number(s)
CONTRACT_GRANT: BMFT-RV14-B8/74
CONTRACT_GRANT: NGR-21-002-224
CONTRACT_GRANT: NAGW-101
CONTRACT_GRANT: NGR-21-002-316
CONTRACT_GRANT: NAS5-28704
CONTRACT_GRANT: NSF ATM-84-07546
Distribution Limits
Public
Copyright
Other

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