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Evidence for solar wind origin of energetic heavy ions in the earth's radiation beltAnalysis of data from our energetic ion composition experiment on ISEE-1 has revealed the presence of substantial fluxes of carbon, oxygen, and heavier ions above 400 keV/nucleon at L values between approximately 2.5 and 4 earth radii. The measured C/O ratio varies systematically from 1.3 at 450 keV/nucleon to 4.1 at 1.3 MeV/nucleon, and no iron is observed above 200 keV/nucleon. These results provide strong evidence for a solar wind origin for energetic ions in the outer radiation belt. The absence of iron and the increase of the carbon-to-oxygen ratio with energy suggest that the condition for the validity of the first adiabatic invariant may have a strong influence on the trapping of these particles.
Document ID
19790033927
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hovestadt, D.
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Klecker, B.
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Scholer, M.
(Max-Planck-Institut fuer Physik und Astrophysik Institut fuer extraterrestrische Physik, Garching, Germany)
Gloeckler, G.
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Ipavich, F. M.
(Maryland, University College Park, Md., United States)
Fan, C. Y.
(Arizona, University Tucson, Ariz., United States)
Fisk, L. A.
(New Hampshire, University Durham, N.H., United States)
Ogallagher, J. J.
(Chicago, University Chicago, Ill., United States)
Date Acquired
August 9, 2013
Publication Date
December 1, 1978
Publication Information
Publication: Geophysical Research Letters
Volume: 5
Subject Category
Space Radiation
Accession Number
79A17940
Funding Number(s)
CONTRACT_GRANT: BMFT-RV14-B8/74
CONTRACT_GRANT: NAS5-20062
Distribution Limits
Public
Copyright
Other

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