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Voyager Measurements of the Energy Spectrum, Charge Composition, and Long Term Temporal Variations of the Anomalous Components in 1977-1982

Webber, W. R. and Cummings, A. C. (1983) Voyager Measurements of the Energy Spectrum, Charge Composition, and Long Term Temporal Variations of the Anomalous Components in 1977-1982. In: Solar Wind V. NASA Conference Publication. No.CP-2280. NASA , Washington, DC, pp. 435-440.

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The large collecting area and wide energy range of the cosmic ray experiment on Voyager 1 and 2 was used to examine the energy spectra, charge composition, and long term temporal variations of the anomalous components in 1977-1982. Individual energy spectra are obtained for 17 separate quiet time periods during the time interval. The composite spectra of anomalous He, N, O, and Ne are obtained to a new level of precision. This includes the spectral shape and the relative abundance. Essentially, the spectral shape of N, O, and Ne appear to be similar. The ratios of anomalous N and Ne to O are found to be different from both the solar cosmic ray and galactic cosmic ray source composition. Some evidence is found for the enhancement of Ar as well. In the case of elements such as C, Mg, S, and Fe it is difficult to separate a possible lower intensity anomalous component from a quasi-steady interplanetary component that appears to be present at the lowest energies. The long term temporal variations of the anomalous He and O components were studied from 1977-82, a period from minimum to maximum in the modulation cycle. The tracking between these anomalous component intensities and the integral intensity of 75 MeV protons is striking; however, the intensity decrease of the anomalous components is much greater.

Item Type:Book Section
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URLURL TypeDescription Proceedings
Cummings, A. C.0000-0002-3840-7696
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Additional Information:We greatly appreciate the efforts of R. E. Vogt, both in his capacity as CRS Principal Investigator and as a colleague who has provided useful discussions. We care grateful to the Caltech and Goddard groups who have supported the CRS experiment. We appreciate helpful discussions with E. C. Stone. This work was supported in part by NASA under contract NAS 7-918 and grants NAGW-200 and NGR 05-002-160.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
NASANGR 05-002-160
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1983-04
Series Name:NASA Conference Publication
Issue or Number:CP-2280
Record Number:CaltechAUTHORS:20140421-162004001
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45094
Deposited By: SWORD User
Deposited On:22 Apr 2014 21:55
Last Modified:20 Feb 2020 14:33

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