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Anomalous Cosmic Ray Measurements in and outside the Magnetosphere: Implications for the Charge State

Adams, J. H., Jr. and Garcia-Munoz, M. and Grigorov, N. L. and Klecker, B. and Kondratyeva, M. A. and Mason, G. M. and Mewaldt, R. A. and Tretyakova, Ch. A. and Tylka, A. J. (1990) Anomalous Cosmic Ray Measurements in and outside the Magnetosphere: Implications for the Charge State. In: Proceedings of the 21st International Cosmic Ray Conference. Vol.6. Department of Physics and Mathematical Physics, The University of Adelaide , Northfield, South Australia, p. 180.

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We report preliminary results from the Joint Study of the Charge State of the Anomalous Component, a cooperative project of the space agencies of the US and the USSR. The so-called "anomalous" cosmic ray component, including the elements He, N, 0, and Ne, as well as rarer species, is believed to represent a sample of neutral interstellar atoms that has been swept into the heliosphere, singly ionized, and then accelerated to energies as high as 60 MeV /nucleon. A key test of this theory is a direct verification that these energetic nuclei are indeed singly ionized. This prediction can be tested by comparing simultaneous measurements of the flux of anomalous cosmic rays made inside and outside the magnetosphere, using the geomagnetic field as a rigidity-dependent filter. Grigorov et al. have recently reported measurements of the flux of 10 MeV /nucleon C, N, and 0 nuclei made during 1986 to 1988 by a series of KOSMOS satellites flown in low Earth orbit. We have analyzed data from the same time periods from several instruments on IMP-8 and ICE, which were located outside the magnetosphere. We compare the 0 fluxes inside and outside the magnetosphere over this time period and examine the implications of these measurements for the charge state of anomalous cosmic rays.

Item Type:Book Section
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URLURL TypeDescription
Mason, G. M.0000-0003-2169-9618
Mewaldt, R. A.0000-0003-2178-9111
Additional Information:© Organizing Committee of the 21st Int. Cosmic Ray Conference. Provided by the NASA Astrophysics Data System. This work was supported in part by NASA contracts NAG8-678, NAG5-728, NAG5-706, and W-16,480; NASA grants NGR 05-002-160, and NGR 21-002-224; NSF grant ATM 87-20608; and BMFT-FRG contract RV 14-BB/74.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
NASANGR 05-002-160
NASANGR 21-002-224
NSFATM 87-20608
Bundesministerium für Forschung und Technologie (BMFT)RV 14-BB/74
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1989-17
Record Number:CaltechAUTHORS:20140708-163614888
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47088
Deposited By: Deborah Miles
Deposited On:21 Jul 2014 21:06
Last Modified:22 Nov 2019 09:58

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