Cummings, A. C. and Stone, E. C.
(1987)
Elemental Composition of the Anomalous Cosmic-Ray Component.
In:
Proceedings of the 21st International Cosmic Ray Conference.
Vol.3.
, Nakau, Russia, pp. 413-416.
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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.
| Item Type: | Book Section |
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| 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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| Group: | Space Radiation Laboratory |
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| Funders: | | Funding Agency | Grant Number |
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| NASA | NAS 7-918 | | NASA | NGR 05-002-160 |
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| Other Numbering System: | | Other Numbering System Name | Other Numbering System ID |
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| Space Radiation Laboratory | 1987-10 |
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| Record Number: | CaltechAUTHORS:20140512-141917916 |
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| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140512-141917916 |
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| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
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| ID Code: | 45699 |
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| Collection: | CaltechAUTHORS |
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| Deposited By: |
Joy Painter
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| Deposited On: | 12 May 2014 21:23 |
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| Last Modified: | 20 Feb 2020 14:33 |
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