Evidence that the anomalous cosmic-ray component is singly ionized
- Creators
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Cummings, A. C.
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Stone, E. C.
- Webber, W. R.
Abstract
We have used data from the Cosmic Ray Subsystem on the Voyager spacecraft to measure the spectra of He, C, N, O, and Ne with 4-124 MeV per nucleon (for O) during solar minimum conditions near the end of 1977. By subtracting both a low-energy interplanetary component and the high-energy galactic component we have determined the energy spectra of the "anomalous" cosmic-ray species He, N, O, and Ne. The energy dependences of such spectra depend upon the charge state of the particles, their source spectra, and the rigidity dependence of the diffusion coefficient. If the source spectra at the boundary of the modulation region have similar power-law energy dependences, then the observed energy spectra indicate that the anomalous particles are singly ionized.
Additional Information
© 1984 American Astronomical Society. Received 1984 July 2; accepted 1984 September 24. We are grateful to R. E. Vogt for his contributions as Principal Investigator for the Cosmic Ray Subsystem on the Voyager spacecraft. We also appreciate the contributions of the other CRS team members consisting of scientists and engineers at the California Institute of Technology, the Goddard Space Flight Center, the University of Arizona, and the University of New Hampshire. We also thank R. A. Mewaldt for several useful discussions. This work was supported in part by NASA under contract NAS 7-918 and grants NAGW-200 and NGR 05-002-160.Attached Files
Published - 1984ApJ___287L__99C.pdf
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Additional details
- Eprint ID
- 44774
- Resolver ID
- CaltechAUTHORS:20140408-115652188
- NAS 7-918
- NASA
- NAGW-200
- NASA
- NGR 05-002-160
- NASA
- Created
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2014-04-08Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Space Radiation Laboratory