Elemental Composition of the Anomalous Cosmic-Ray Component
- Creators
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Cummings, A. C.
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Stone, E. C.
- Other:
- Kozyarivsky, V. A.
Abstract
We report the first definitive observations of anomalous cosmic-ray (ACR) argon and carbon. Using a model for the ionization and acceleration of interstellar neutral atoms, we find A CR-derived abundances for NI, Ne I, and Ar I in the very local interstellar medium (VLISM) that are in excellent agreement with a compilation of solar system abundances, showing no evidence that significant charge-exchange processes are associated with the heliopause region. The abundance of CI is nearly 2 orders of magnitude lower than that of the solar system, indicating that most of the C in the VLISM is ionized. We find that neither of two spectroscopically determined local interstellar components have neutral compositions identical to that of the ACR-derived VLISM.
Additional Information
© INR. Provided by the NASA Astrophysics Data System. We thank R. A. Mewaldt for many helpful discussions. We thank M. Allen for a tabulation of some of the photoionization cross sections we used. This work was supported in part by NASA under contract NAS 7-918 and grant NGR 05-002-160.Attached Files
Published - 1987-10.pdf
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Additional details
- Eprint ID
- 45699
- Resolver ID
- CaltechAUTHORS:20140512-141917916
- NASA
- NAS 7-918
- NASA
- NGR 05-002-160
- Created
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2014-05-12Created from EPrint's datestamp field
- Updated
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2020-02-20Created from EPrint's last_modified field
- Caltech groups
- Space Radiation Laboratory
- Other Numbering System Name
- Space Radiation Laboratory
- Other Numbering System Identifier
- 1987-10