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Evidence for Multiply Charged Anomalous Cosmic Rays

Mewaldt, R. A. and Selesnick, R. S. and Cummings, A. C. and Stone, E. C. and von Rosenvinge, T. T. (1996) Evidence for Multiply Charged Anomalous Cosmic Rays. Astrophysical Journal Letters, 466 (1). L43-L46. ISSN 2041-8205. doi:10.1086/310169.

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New measurements from the SAMPEX spacecraft show that most anomalous cosmic ray (ACR) oxygen nuclei with energies above 20 MeV nucleon^(-1) are multiply ionized, with ionic charge states of Q = 2, Q = 3, and probably higher. This new result contrasts with lower energies, at which most ACRs are singly charged. The observed abundance of multiply charged ions agrees with estimates of the fraction of singly charged ACRs that undergo electron stripping during acceleration if the timescale for acceleration to 10 MeV nucleon^(-1) is ~1 yr. The existence of multiply charged ACRs helps explain their acceleration to high energies, and it has implications for several other studies.

Item Type:Article
Related URLs:
URLURL TypeDescription
Mewaldt, R. A.0000-0003-2178-9111
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Additional Information:© 1996. The American Astronomical Society. This work was supported by NASA under grants NAS5-30704 and NAGW-1919. We appreciate discussions with J. R. Jokipii, B. Klecker, and A. C. Cummings.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Subject Keywords:cosmic rays - interplanetary medium - solar wind
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1996-16
Issue or Number:1
Record Number:CaltechAUTHORS:20140703-214349007
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46832
Deposited By: Deborah Miles
Deposited On:24 Jul 2014 23:14
Last Modified:10 Nov 2021 17:29

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