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Published 1999 | Published
Book Section - Chapter Open

Measurements of the Elemental Composition of Galactic Cosmic Ray Nuclei with 6≤Z≤28 from the Cosmic Ray Isotope Spectrometer on ACE


The elemental abundances of galactic cosmic rays (GCR) observed near Earth provide information about the composition of the cosmic ray sources as well as their propagation history. The Cosmic Ray Isotope Spectrometer (CRIS) onboard the Advanced Composition Explorer (ACE) spacecraft measures the elemental and isotopic composition of GCRs with energies '"" 50 - 500 Me V /nucleon with high statistical accuracy ('"" 5000 stopping nuclei heavier than helium per day) due to its large geometrical factor. The CRIS data are used to derive cosmic ray abundances at the lowest level of solar activity during the last solar minimum. We present elemental abundances measured by CRIS, compare them with previous measurements, and discuss the plausible origins of the disagreement.

Additional Information

Copyright University of Utah. Provided by the NASA ADS. Climax neutron monitor data were provided courtesy of the University of Chicago and the National Science Foundation Grant ATM-9613963.

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August 19, 2023
October 20, 2023