Published 1990
| Published
Book Section - Chapter
Open
Elemental Composition of the Very Local Interstellar Medium as Deduced from Observations of Anomalous Cosmic Rays
- Creators
-
Cummings, A. C.
-
Stone, E. C.
- Other:
- Protheroe, Raymond J.
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.
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..Attached Files
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Additional details
- Eprint ID
- 47193
- Resolver ID
- CaltechAUTHORS:20140714-155302359
- NSF
- NAS-7-918
- NSF
- NGR-05-002-160
- Created
-
2014-07-21Created from EPrint's datestamp field
- Updated
-
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
- 1989-20