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Ionic charge state distribution of helium, carbon, oxygen, and iron in an energetic storm particle enhancementAn analysis is presented of the ionic charge state distribution of He, C, O and Fe in the energetic storm particle event of September 28-29, 1978. Data were obtained with the ULEZEQ electrostatic analyzer-proportional counter on board the ISEE 3 spacecraft. The He(+)/He(++) ratio between 0.4 and 1 MeV/n is shown to be significantly lower during the energetic storm particle event than during the preceding period of solar flare particle enhancement, with a temporal evolution similar to that of the Fe/He ratio as reported by Klecker et al. (1981). Increases in the mean charge state for oxygen by about 3% and for iron by about 16% are also noted. The temporal variations in charge states are accounted for in terms of first-order Fermi acceleration of the pre-existing solar flare particles by a propagating interplanetary shock wave.
Document ID
19820053759
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hovestadt, D.
(Max-Planck-Inst. fuer Physik und Astrophysik Garching, Germany)
Klecker, B.
(Max-Planck-Inst. fuer Physik und Astrophysik Garching, Germany)
Hoefner, H.
(Max-Planck-Inst. fuer Physik und Astrophysik Garching, Germany)
Scholer, M.
(Max-Planck-Institut fuer Physik und Astrophysik Garching, Germany)
Gloeckler, G.
(Max-Planck-Inst. fuer Physik und Astrophysik Garching, Germany)
Ipavich, F. M.
(Maryland, University College Park, MD, United States)
Date Acquired
August 10, 2013
Publication Date
July 1, 1982
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
82A37294
Funding Number(s)
CONTRACT_GRANT: NAS5-20062
CONTRACT_GRANT: BMFT-RV14-B8/74
CONTRACT_GRANT: BMFT-01-OI-017-ZA/WF/WRK-2754
Distribution Limits
Public
Copyright
Other

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