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Energy dependence of the ionic charge state distribution during the November 1997 solar energetic particle event
Author(s) -
Möbius E.,
Popecki M.,
Klecker B.,
Kistler L. M.,
Bogdanov A.,
Galvin A. B.,
Heirtzler D.,
Hovestadt D.,
Lund E. J.,
Morris D.,
Schmidt W. K. H.
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1998gl900131
Subject(s) - range (aeronautics) , ionic bonding , charge (physics) , atomic physics , particle (ecology) , ionic potential , physics , spectrum analyzer , ion , chemical physics , materials science , geology , optics , oceanography , quantum mechanics , composite material
Ionic charge state distributions for a variety of species, such as C, O, Ne, Mg, Si and Fe were obtained with the Solar Energetic Particle Ionic Charge Analyzer (SEPICA) on ACE for the strongest of a series of energetic particle events after the November 4 and 7, 1997, flares. The capabilities of SEPICA allow a much more detailed analysis of the charge distributions than previous instrumentation. Over the energy range from ≈ 0.2 to 1 MeV/Nuc a trend is observed that shows charge states increasing with energy, in particular for Mg, Si and Fe. In addition, for Fe a mixed charge state distribution with a distinct peak at lower charge states (10–14) is observed simultaneously with a tail reaching to charge states up to ≈ 20. This may be an indication of a mixture of different energetic particle populations.