The Mean Charge State of Anomalous Cosmic Ray Oxygen

Creators: Adams, J. H., Jr.; Garcia-Munoz, M.; Grigorov, 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 =0.9(+0.3/-0.2) for ~10 MeV/nuc anomalous oxygen, consistent with the model of Fisk, Kozlovsky, and Ramaty in which anomalous cosmic rays originate from the neutral component of the local interstellar medium (ISM). This same approach gives =+7 for solar energetic oxygen ions.

Additional Information

Dublin Institute for Advanced Studies. Provided by the NASA Astrophysics Data System. We thank NASA and IKI for sponsoring this study. We thank D. I. Kozlov for the Cosmos flights. This work is supported in part by NASA contracts NAG8-678, NAGS-706, W-17 ,358; NASA grants NAGS-728, NOR 05-002-160, NAGW-1990; NSF grant ATM90-20608; and BMFT-FRG contract RV 14-B8;74.

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