CaltechAUTHORS
Published January 15, 1999 | Version Published
Journal Article Open

Inferred charge states of high energy solar particles from the Solar Isotope Spectrometer on ACE

Creators

  • 1. ROR icon California Institute of Technology
  • 2. ROR icon Jet Propulsion Lab
  • 3. ROR icon Goddard Space Flight Center

Abstract

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 × 10^6K, significantly higher than deduced at lower energies.

Additional Information

© 1999 by the American Geophysical Union. Received: September 2, 1998; Revised: October 29, 1998; Accepted: November 3, 1998. Paper number 1998GL900218. We thank the large group of dedicated individuals that contributed to the development of the SIS instrument (listed in Stone et al. 1998). This research was supported by NASA at the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, and the Goddard Space Flight Center.

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Additional details

Identifiers

Eprint ID
48990
Resolver ID
CaltechAUTHORS:20140827-114427003

Funding

NASA
NAG5-6912
JPL
Goddard Space Flight Center

Dates

Created
2014-08-27
Created from EPrint's datestamp field
Updated
2021-11-10
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Caltech Custom Metadata

Caltech groups
Space Radiation Laboratory , Physics Department
Other Numbering System Name
Space Radiation Laboratory
Other Numbering System Identifier
1998-05