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Published 1987 | Version Published
Book Section - Chapter Open

Elemental Composition of the Anomalous Cosmic-Ray Component

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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.

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45699
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CaltechAUTHORS:20140512-141917916

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http://adsabs.harvard.edu/abs/1987ICRC....3..413C (URL)

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NASA
NAS 7-918
NASA
NGR 05-002-160

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2014-05-12
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2020-02-20
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Space Radiation Laboratory
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Space Radiation Laboratory
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1987-10