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The Isotopic Composition of Anomalous Cosmic Rays from Sampex

Leske, R. A. and Mewaldt, R. A. and Cummings, A. C. and Cummings, J. R. and Stone, E. C. and von Rosenvinge, T. T. (1996) The Isotopic Composition of Anomalous Cosmic Rays from Sampex. In: The Heliosphere in the Local Interstellar Medium. Space Science Series of ISSI. No.1. Springer Netherlands , Dordrecht, pp. 149-154. ISBN 9789401072960.

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Measurements of the anomalous cosmic ray (ACR) isotopic composition have been made in three regions of the magnetosphere accessible from the polar Earth orbit of SAMPEX, including the interplanetary medium at high latitudes and geomagnetically trapped ACRs. At those latitudes where ACRs can penetrate the Earth's magnetic field while fully stripped galactic cosmic rays (GCRs) of similar energies are excluded, a pure ACR sample is observed to have the following composition: ¹⁵N/N < 0.023, ¹⁸O/¹⁶O < 0.0034, and ²²Ne/²⁰Ne = 0.077(+0.085, -0.023). We compare our values with those found by previous investigators and with those measured in other samples of solar and galactic material. In particular, a comparison of ²²Ne/²⁰Ne measurements from various sources implies that GCRs are not simply an accelerated sample of the local interstellar medium.

Item Type:Book Section
Related URLs:
URLURL TypeDescription ReadCube access ItemJournal Article
Leske, R. A.0000-0002-0156-2414
Mewaldt, R. A.0000-0003-2178-9111
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Additional Information:© 1996 Springer. We appreciate contributions by R. S. Selesnick. This work was supported by NASA under contract NAS5-30704 and grant NAGW-1919.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Subject Keywords:abundances, isotopes, anomalous cosmic rays, SAMPEX, neon, interstellar medium, heliosphere, trapped heavy ions
Series Name:Space Science Series of ISSI
Issue or Number:1
Record Number:CaltechAUTHORS:20200511-151236312
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103111
Deposited By: George Porter
Deposited On:11 May 2020 22:31
Last Modified:16 Nov 2021 18:18

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