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The Isotopic Composition of Anomalous Cosmic Ray Neon

Cummings, A. C. and Stone, E. C. and Webber, W. R. (1991) The Isotopic Composition of Anomalous Cosmic Ray Neon. In: Proceedings of the 22nd International Cosmic Ray Conference. Vol.3. Institute for Advanced Studies , Dublin, Ireland, pp. 362-364. https://resolver.caltech.edu/CaltechAUTHORS:20140924-095030514

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Abstract

We have used observations of neon in the energy interval 14.6 - 35.6 MeV /nuc from the cosmic-ray experiment on the Voyager 2 (V2) spacecraft during 1986-1988 to derive the ^(22)Ne/^(20)Ne ratio for the source material of the anomalous cosmic rays (ACRs). Because of the relatively small contamination from galactic cosmic-ray (CCR) neon during the time period selected, we have significantly improved the precision with which this ratio is known. We find that the derived ACR source ratio, ^(22)Ne/^(20)Ne = 0.077 +0.068/-0.043, is consistent with the composition of the solar wind (0.073) and meteoritic neon-A (0.12), but inconsistent with the galactic cosmic ray source (0.43). This finding places new limits on the possible source material of the anomalous component. If the anomalous component does derive from the inward flowing interstellar neutral gas, then the composition of the source of galactic cosmic rays differs from that of the very local interstellar medium (VLISM).


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://adsabs.harvard.edu/abs/1991ICRC....3..362CADSAbstract
http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1991ICRC....3..362C&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdfADSArticle
Additional Information:© Dublin Institute for Advanced Studies. Provided by the NASA Astrophysics Data System. This work was supported in part by NASA under contract NAS7-918 and grant NAGW-1919.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANAGW-1919
NASANAS7-918
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1991-12
Record Number:CaltechAUTHORS:20140924-095030514
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140924-095030514
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49983
Collection:CaltechAUTHORS
Deposited By: Deborah Miles
Deposited On:29 Sep 2014 16:19
Last Modified:03 Oct 2019 07:19

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