Cummings, A. C. and Stone, E. C.
(1990)
Elemental Composition of the Very Local Interstellar Medium as Deduced from Observations of Anomalous Cosmic Rays.
In:
Proceedings of the 21st International Cosmic Ray Conference.
Vol.6.
Department of Physics and Mathematical Physics, University of Adelaide
, Northfield, South Australia, pp. 202-205.
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Abstract
We present a new determination of the relative abundances of the interstellar neutral
atoms CI, NI, 0 I, and Ar I. These abundances are derived from Voyager observations
of the energy spectra of the anomalous cosmic ray- (ACR) component (He, C, N, 0, Ne, and
Ar), using a new analysis technique. We find that the abundances of NI, 0 I, and Ar I are
in good agreement with solar system abundances, while the abundance of CI is ~1/100 of
the solar system value, consistent with the expectation that C is mostly ionized in the local
interstellar medium. As we have reported earlier, we find no evidence for charge-changing
interactions associated with the heliopause region.
| Item Type: | Book Section |
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| Additional Information: | © Organizing Committee of the 21st Int. Cosmic Ray Conference. Provided by the NASA Astrophysics Data System.
We thank E. Christian for providing the ACR helium spectrum
and M. Allen for a compilation of photoionization cross sections. We thank H.
Ogawa for a helpful discussion. 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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| NSF | NAS-7-918 | | NSF | 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 | 1989-20 |
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| Record Number: | CaltechAUTHORS:20140714-155302359 |
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| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140714-155302359 |
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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: | 47193 |
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| Collection: | CaltechAUTHORS |
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| Deposited By: |
Deborah Miles
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| Deposited On: | 21 Jul 2014 20:30 |
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| Last Modified: | 20 Feb 2020 14:33 |
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