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Energy Spectra of Anomalous Cosmic-Ray Oxygen During 1977-1987

Cummings, A. C. and Stone, E. C. (1987) Energy Spectra of Anomalous Cosmic-Ray Oxygen During 1977-1987. In: Proceedings of the 21st International Cosmic Ray Conference. Vol.3. , Nakau, Russia, pp. 421-424.

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We have previously reported that the energy of the peak intensity of the spectrum of anomalous cosmic-ray oxygen moved upwards by a factor of -2 near the time of the reversal of the solar magnetic field in 1980. An energy shift which persists into the next solar minimum period would agree with a key prediction of a theory of the acceleration and propagation of the anomalous component by Jokipii. That model also predicts distinctly different spectral shapes in the two halves of the solar magnetic cycle. Although we cannot yet rule out the possibility of a long-term hysteresis in the recovery of the low-rigidity particles, our spectral measurements through late 1986 agree remarkably well with these predictions.

Item Type:Book Section
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Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Additional Information:© INR. Provided by the NASA Astrophysics Data System. We appreciate the contributions of W. R. Webber, who could not be a co-author on this paper because of conference limitations. We also 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 and the Goddard Space Flight Center. This work was supported in part by NASA under contract NAS 7-918 and grant NGR 05-002-160.
Group:Space Radiation Laboratory
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NASANGR 05-002-160
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Space Radiation Laboratory1987-12
Record Number:CaltechAUTHORS:20140513-100423829
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ID Code:45709
Deposited By: Joy Painter
Deposited On:13 May 2014 17:09
Last Modified:20 Feb 2020 14:33

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