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. https://resolver.caltech.edu/CaltechAUTHORS:20140714-155302359
|
PDF
- Published Version
See Usage Policy. 330Kb |
Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20140714-155302359
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 | ||||||
|---|---|---|---|---|---|---|---|
| Related URLs: |
| ||||||
| 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.. | ||||||
| Group: | Space Radiation Laboratory | ||||||
| Funders: |
| ||||||
| Other Numbering System: |
| ||||||
| Record Number: | CaltechAUTHORS:20140714-155302359 | ||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140714-155302359 | ||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||
| ID Code: | 47193 | ||||||
| Collection: | CaltechAUTHORS | ||||||
| Deposited By: | Deborah Miles | ||||||
| Deposited On: | 21 Jul 2014 20:30 | ||||||
| Last Modified: | 03 Oct 2019 06:51 |
Repository Staff Only: item control page
