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A New Look at Neon-C and SEP-Neon

Mewaldt, R. A. and Ogliore, R. C. and Gloeckler, G. and Mason, G. M. (2001) A New Look at Neon-C and SEP-Neon. In: Solar and Galactic Composition. AIP Conference Proceedings. No.598. American Institute of Physics , Melville, NY, pp. 393-398. ISBN 0-7354-0042-3.

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Studies of the isotopic composition of neon in lunar soils, meteorites, and interplanetary dust particles have revealed several distinct components. In addition to implanted solar wind, which has a ^(20)Ne/^(22)Ne-abundance ratio of 13.7, there is an additional component with ^(20)Ne/^(22)Ne≈11.2, originally attributed to higher-energy solar energetic particles. Using data from the Advanced Composition Explorer, we have measured the fluence of solar wind, suprathermal particles, solar energetic particles and cosmic rays from ~0.3 keV/nucleon to ~300 MeV/nucleon over an extended time period. We use these measured spectra to simulate the present-day depth distribution of Ne isotopes implanted in the lunar soil. We find that the suprathermal tail of the solar wind, extending from a few keV/nucleon to several MeV/nucleon with a power law spectrum, can produce ^(20)Ne/^(22)Ne abundance ratios in the lunar soil that are similar to the measured composition, although there remain significant questions about the extent to which the present-day intensity of suprathermal ions is sufficient to explain the lunar observations.

Item Type:Book Section
Related URLs:
URLURL TypeDescription DOIArticle
Mewaldt, R. A.0000-0003-2178-9111
Mason, G. M.0000-0003-2169-9618
Additional Information:© 2001 American Institute of Physics. Issue Date: 21 November 2001. This work was supported by NASA at Caltech (under grant NAS5-6912) and at the University of Maryland. We thank D. Burnett and M. Wiedenbeck for help with TRIM simulations and R. Wimmer-Schweingruber for discussions of SEP neon. We greatly appreciate the assistance of R. Wieler in interpreting noble gas measurements in lunar samples.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
University of MarylandUNSPECIFIED
Subject Keywords:solar wind; meteorites; lunar surface; interplanetary matter; ion implantation; isotope relative abundance; neon; solar cosmic ray particles
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2003-29
Series Name:AIP Conference Proceedings
Issue or Number:598
Classification Code:PACS: 96.50.Ek; 96.35.Gt; 96.20.Dt
Record Number:CaltechAUTHORS:20111110-155919555
Persistent URL:
Official Citation:A new look at neon-C and SEP-neon R. A. Mewaldt, R. C. Ogliore, G. Gloeckler, and G. M. Mason, AIP Conf. Proc. 598, 393 (2001), DOI:10.1063/1.1434028
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27742
Deposited On:11 Nov 2011 22:43
Last Modified:09 Nov 2021 16:51

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