The Return of the Anomalous Cosmic Rays to 1 AU in 1992

Creators: Mewaldt, R. A.; Cummings, A. C.; Cummings, J. R.; Stone, E. C.; Klecker, B.; Hovestadt, D.; Scholer, M.; Mason, G. M.; Mazur, J. E.; Hamilton, D. C.; von Rosenvinge, T. T.; Blake, J. B.

Abstract

New observations of low energy (approximately 1 to 200 MeV/nuc) cosmic rays measured by three newly launched experiments on Solar, Anomalous, and Magnetospheric Particle Explorer (SAMPEX) during 1992 and 1993 show the strong presence of anomalous cosmic ray (ACR) nitrogen and oxygen, well before the approaching solar minimum. When compared with ACR temporal variations over the past two solar cycles we find that the 1992-1993 fluxes are approximately 5 to 10 times their level at corresponding neutron monitor counting rates in 1969-1970 and 1985

Additional Information

Copyright 1993 by the American Geophysical Union. Received August 12, 1993; accepted August 23, 1993. We are grateful to J. Labonte and J. Lockwood for providing unpublished Mt. Washington neutron monitor data and to J. T. Hoeksema for providing unpublished data on the neutral sheet slit. This work was supported by NASA under contract NAS5-30704, grant NAGW- 1919, and NASA Cooperative Agreement 26979B at The Aerospace Corporation. Work at the Max-Planck Institut was funded by the Bundesministefiumfur Forschung und Technologie, FRG, under contract 50 OC 90021.

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