Published October 1986
| Published
Journal Article
Open
Solar cycle variations of anomalous ^4He as deduced by studies of cosmic ray ^3He
- Creators
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Cummings, A. C.
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Mewaldt, R. A.
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Stone, E. C.
Abstract
Voyager 1 and 2 observations have been used to derive the energy spectrum of 'anomalous' cosmic ray (ACR) helium using a technique based on the separation of the isotopes of He. Previously reported observations show that the ACR oxygen spectrum underwent a change in shape following the solar magnetic field reversal in 1980; in this paper we present evidence for a corresponding change in the ACR helium spectrum. We find that the energy spectra of ACR helium and oxygen and galactic cosmic ray (GCR) ^4He and ^3He can be reproduced both before and after the field reversal using a simple solar modulation model in which the effects of curvature and gradient drifts are arbitrarily neglected.
Additional Information
© 1986 by the American Geophysical Union. Received July 31, 1986; Accepted August 26, 1986. We are grateful to R.E. Vogt for his contributions during his tenure as principal investigator for the Voyager CRS. We also appreciate the contributions of the other Voyager CRS team members at Caltech, Goddard Space Flight Center, and the Universities of Arizona and New Hampshire. This work was supported in part by NASA under contracts NAS 7-918 and NAG5-722, and grant NGR 05-002-160.Attached Files
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Additional details
- Eprint ID
- 43873
- Resolver ID
- CaltechAUTHORS:20140219-103051736
- NASA
- NAS 7-918
- NASA
- NAG5-722
- NASA
- NGR 05-002-160
- Created
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2014-02-25Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Space Radiation Laboratory