Evidence for Trapped Anomalous Cosmic Ray Oxygen Ions in the Inner Magnetosphere

Creators: Grigorov, N. L.; Kondratyeva, M. A.; Panasyuk, M. I.; Tretyakova, Ch. A.; Adams, J. H., Jr.; Blake, J. B.; Schulz, M.; Mewaldt, R. A.; Tykla, A. J.

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Abstract

A series of measurements of 5–30 MeV/nucleon oxygen ions made with track detector stacks on Cosmos satellites show isotropic angular distributions during solar energetic particle events. Solar-quiet times, on the other hand, have highly anisotropic distributions suggestive of a trapped-particle component. Detailed Monte Carlo simulations confirm this interpretation and allow us to measure the trapped and cosmic-ray contributions to the observed fluxes. Our data are fully consistent with anomalous cosmic-ray ions, rather than radial diffusion from the outer zone, as the source of the trapped particles.

Additional Information

Copyright 1991 by the American Geophysical Union. (Received: August 14, 1991; accepted September 9, 1991.) We gratefully acknowledge the efforts of NASA and IKI in the US/USSR Joint Working Group on Solar-Terrestrial Physics, which sponsored this study. We especially thank Vernon Jones for his encouragement and support. We thank D.I. Kozlov, general contractor for Cosmos, for the many flights that provided the Cosmos data. We also thank the Space Analysis and Data Branch (J3SOS) of the US Space Command for providing the Cosmos orbital data. This work is supported in part by NASA contract W-17,358, by NASA grant NAG5-727, and by the Aerospace Sponsored Research (ASR) Program of the Aerospace Corporation.

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