The Charge State of the Anomalous Component of Cosmic Rays

Creators: Adams, J. H., Jr.; Garcia-Munoz, M.; Gigorov, N. L.; Klecker, B.; Kondratyeva, M. A.; Mason, G. M.; McGuire, R. E.; Mewaldt, R. A.; Panasyuk, M. I.; Tretyakova, Ch. A.; Tylka, A. J.; Zhuravlev, D. A.

Abstract

The ionic charge state of anomalous cosmic-ray oxygen has been determined by comparing measurements obtained inside the magnetosphere on a series of Cosmos satellite flights with simultaneous observations outside the magnetosphere from IMP 8 and ICE. We find a mean charge state of 0.9 ^(+0.3)_(-0.2) for ~10 MeV nucleon^(-1) anomalous oxygen, consistent with the model of Fisk, Kozlovsky, & Ramaty, in which the anomalous cosmic rays originate from the neutral component of the local interstellar medium. This same approach gives results consistent with a mean charge of +7 for solar energetic oxygen ions.

Additional Information

Copyright 1991, American Astronomical Society. Received 1991 March 4; accepted 1991 April 29. We very much appreciate the efforts of NASA and IKI that made possible this joint study under the US/USSR Joint Working Group on Solar Terrestrial Physics. We especially thank Vernon Jones for his participation in our meetings of the US and Soviet teams and his encouragement and support of this work. We also thank D. I. Kpzlov, general contractor for Cosmos, for the many flights of track detectors that provided us with the Cosmos data. This work is supported in part by NASA contracts NAG8-678, NAG5-706, W-17,538; NASA grants NAG5-728, NGR 05-002-1560, NAGW-1919, NAGW-1990,; NSF grant ATM87-20608; and BMFT-FRG contract RV 14-B8/74.

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