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Published June 13, 2000 | Version Published
Book Section - Chapter Open

Anomalous cosmic ray composition from ACE

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  • 1. ROR icon California Institute of Technology

Contributors

Abstract

During solar quiet periods, the Solar Isotope Spectrometer (SIS) on the Advanced Composition Explorer (ACE) measures the composition and energy spectra of anomalous cosmic rays (ACRs) with energies >8 MeV/nucleon in interplanetary space at 1 AU. In particular, the spectra of individual isotopes for the ACR elements N, O, and Ne are studied with SIS. Intensity enhancements are found in low energy 18O and 22Ne, with relative abundances of ^(18)O/^(16)O ~ 0.002 and ^(22)Ne/^(20)Ne ~ 0.1. The neon abundance ratio appears more similar to that found in the solar wind than in meteorites and is far below that determined for the galactic cosmic ray (GCR) source, indicating that GCRs contain material from sources other than just the local interstellar medium.

Additional Information

© 2000 American Institute of Physics. Issue Date: 13 June 2000. 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. We thank the large group of individuals who contributed to the development of the SIS instrument [17] and the SIS science collaborators R. A. Mewaldt, E. R. Christian, C. M. S. Cohen, A. C. Cummings, P. L. Slocum, E. C. Stone, T. T. von Rosenvinge, and M. E. Wiedenbeck. Climax neutron monitor data were obtained from the web, courtesy of the University of Chicago, National Science Foundation grant ATM-9613963.

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Identifiers

Eprint ID
28268
Resolver ID
CaltechAUTHORS:20111201-093626829

Funding

NASA
NAG5-6912
JPL
Goddard Space Flight Center

Dates

Created
2011-12-05
Created from EPrint's datestamp field
Updated
2021-11-09
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Caltech Custom Metadata

Caltech groups
Space Radiation Laboratory
Series Name
AIP Conference Series
Series Volume or Issue Number
516
Other Numbering System Name
Space Radiation Laboratory
Other Numbering System Identifier
2000-50