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Published September 15, 2000 | Published
Book Section - Chapter Open

Galactic Cosmic Ray Neon Isotopic Abundances Measured on ACE


Measurements of neon isotopic abundances from the ACE-CRIS experiment are presented. Abundances have been obtained in six energy intervals over the energy range of ~100≤E≤280 MeV/nucleon. These measurements are compared with the ACE-SIS data for lower energies extending down to ~8 MeV/nucleon. We find that the CRIS ^(22)Ne/^(20)Ne abundance ratio at the source is a factor of 5.0±0.3 greater than for the solar wind. The CRIS measured abundances agree well with previous experiments. The CRIS and SIS measurements are in good agreement for the higher SIS energies. However for the lower energy SIS data, where the anomalous cosmic rays (ACR) are being sampled, the ratio decreases and agrees with solar wind abundances. The implications of these results are discussed.

Additional Information

© 2000 American Institute of Physics. Issue Date: 15 September 2000. This research was supported by the National Aeronautics and Space Administration at Washington University, the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, and the Goddard Space Flight Center. It was also supported by the McDonnell Center for the Space Sciences at Washington University.

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