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Composition of Anomalous Cosmic Rays

Cummings, A. C. and Stone, E. C. (2007) Composition of Anomalous Cosmic Rays. Space Science Reviews, 130 (1-4). pp. 389-399. ISSN 0038-6308.

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The “classic” anomalous cosmic ray (ACR) component originates as interstellar neutral atoms that drift into the heliosphere, become ionized and picked up by the solar wind, and carried to the outer heliosphere where the pickup ions are accelerated to hundreds of MeV, presumably at the solar wind termination shock. These interstellar ACRs are predominantly singly charged, although higher charge states are present and become dominant above ∼350 MeV. Their isotopic composition is like that of the solar system and unlike that of the source of galactic cosmic rays. A comparison of their energy spectra with the estimated flux of pickup ions flowing into the termination shock reveals a mass-dependent acceleration efficiency that favors heavier ions. There is also a heliospheric ACR component as evidenced by “minor” ACR ions, such as Na, Mg, S, and Si that appear to be singly-ionized ions from a source likely in the outer heliosphere.

Item Type:Article
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URLURL TypeDescription DOIArticle ReadCube access
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Additional Information:© 2007 Springer Science+Business Media, Inc. Received: 10 January 2007; Accepted: 16 February 2007; Published online: 5 May 2007. We appreciate discussions with R. Mewaldt and N. Schwadron. This work was supported by NASA under contract NAS7-03001.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Subject Keywords:anomalous cosmic rays; composition; local interstellar medium; solar wind termination shock; heliosphere; ACE; SAMPEX; voyager
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2007-12
Issue or Number:1-4
Record Number:CaltechAUTHORS:20140716-161335184
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47276
Deposited By: Tony Diaz
Deposited On:16 Jul 2014 23:30
Last Modified:03 Oct 2019 06:52

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