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Short and Long Term Variations of the Anomalous Component

Cummings, A. C. and Mewaldt, R. A. and Webber, W. R. (1983) Short and Long Term Variations of the Anomalous Component. In: Proceedings of the 18th International Cosmic Ray Conference. Vol.10. Tata Institute of Fundamental Research , Bombay, India, pp. 30-33.

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We have used data from the cosmic ray experiment (CRS) on Voyagers 1 and 2 to examine anomalous 0 and He in the time period from launch in 1977 to mid-1982. We find several time periods where large periodic (typically 26 day) temporal variations of 0 between - 5 -15 Me V /nuc are present, with variations in intensity by up to a factor of 10. On the longer term, there is a sharp drop in the anomalous 0 intensity relative to the galactic co.smic ray components near the middle of 1980. After the decrease we still find evidence at - 10 AU for the presence of anomalous 0 and He near the time of maximum modulation. Data from a larger fraction of the solar cycle will be required before it can be determined whether the intensity of the anomalous component is lower in the Second half of the cycle (after the solar field reversal) than in the first half.

Item Type:Book Section
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URLURL TypeDescription
Cummings, A. C.0000-0002-3840-7696
Mewaldt, R. A.0000-0003-2178-9111
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Additional Information:© INSDOC. Provided by the NASA Astrophysics Data System. We thank R. Vogt for useful diScussions and for his efforts as CRS Principal Investigator. We also thank E. C. Stone for important contributions to this work. 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
Non-Subject Keywords:Annual Variations, Energy Spectra, Galactic Cosmic Rays, Helium, Oxygen, Solar Activity Effects, Anomalies, Voyager 1 Spacecraft, Voyager 2 Spacecraft
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Space Radiation Laboratory1983-26
Record Number:CaltechAUTHORS:20140429-083239292
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45264
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Deposited On:13 May 2014 19:18
Last Modified:20 Feb 2020 14:33

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