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.
https://resolver.caltech.edu/CaltechAUTHORS:20111110-155919555
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Abstract
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 |
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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. |
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Group: | Space Radiation Laboratory |
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Funders: | Funding Agency | Grant Number |
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NASA/Caltech | NAS5-6912 | University of Maryland | UNSPECIFIED |
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Subject Keywords: | solar wind; meteorites; lunar surface; interplanetary matter; ion implantation; isotope relative abundance; neon; solar cosmic ray particles |
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Other Numbering System: | Other Numbering System Name | Other Numbering System ID |
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Space Radiation Laboratory | 2003-29 |
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Series Name: | AIP Conference Proceedings |
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Issue or Number: | 598 |
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Classification Code: | PACS: 96.50.Ek; 96.35.Gt; 96.20.Dt |
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DOI: | 10.1063/1.1434028 |
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Record Number: | CaltechAUTHORS:20111110-155919555 |
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Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20111110-155919555 |
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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 |
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Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
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ID Code: | 27742 |
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Collection: | CaltechAUTHORS |
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Deposited By: |
Jason Perez
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Deposited On: | 11 Nov 2011 22:43 |
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Last Modified: | 09 Nov 2021 16:51 |
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