Inferred charge states of high energy solar particles from the solar isotope spectrometer on ACE

The large solar event on November 6, 1997, was enriched in heavy elements (Fe/O ∼ 1) with very hard energy spectra (power law index of −2). There was also a large enrichment in heavier isotopes, suggesting unusually strong charge to mass (Q/M) fractionation (∼(Q/M)−7). Assuming that the fractionatio...

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Bibliographic Details
Published in:Geophysical research letters 1999-01, Vol.26 (2), p.149-152
Main Authors: Cohen, C. M. S., Cummings, A. C., Leske, R. A., Mewaldt, R. A., Stone, E. C., Dougherty, B. L., Wiedenbeck, M. E., Christian, E. R., von Rosenvinge, T. T.
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Language:English
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Summary:The large solar event on November 6, 1997, was enriched in heavy elements (Fe/O ∼ 1) with very hard energy spectra (power law index of −2). There was also a large enrichment in heavier isotopes, suggesting unusually strong charge to mass (Q/M) fractionation (∼(Q/M)−7). Assuming that the fractionation is dominated by Q/M and first ionization potential (FIP) related processes, we have inferred the charge states of twelve elements with energies of 12–60 MeV/nucleon. These results suggest a source temperature of 3–6 × 106K, significantly higher than deduced at lower energies.
ISSN:0094-8276
1944-8007
DOI:10.1029/1998GL900218