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Composition of Light Solar Wind Noble Gases in the Bulk Metallic Glass flown on the Genesis Mission

Grimberg, A. and Burnett, D. S. and Bochsler, P. and Baur, H. and Wieler, R. (2007) Composition of Light Solar Wind Noble Gases in the Bulk Metallic Glass flown on the Genesis Mission. Space Science Reviews, 130 (1-4). pp. 293-300. ISSN 0038-6308. https://resolver.caltech.edu/CaltechAUTHORS:20100910-112210816

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Abstract

We discuss data of light noble gases from the solar wind implanted into a metallic glass target flown on the Genesis mission. Helium and neon isotopic compositions of the bulk solar wind trapped in this target during 887 days of exposure to the solar wind do not deviate significantly from the values in foils of the Apollo Solar Wind Composition experiments, which have been exposed for hours to days. In general, the depth profile of the Ne isotopic composition is similar to those often found in lunar soils, and essentially very well reproduced by ion-implantation modelling, adopting the measured velocity distribution of solar particles during the Genesis exposure and assuming a uniform isotopic composition of solar wind neon. The results confirm that contributions from high-energy particles to the solar wind fluence are negligible, which is consistent with in-situ observations. This makes the enigmatic “SEP-Ne” component, apparently present in lunar grains at relatively large depth, obsolete. ^(20)Ne/^( 22)Ne ratios in gas trapped very near the metallic glass surface are up to 10% higher than predicted by ion implantation simulations. We attribute this superficially trapped gas to very low-speed, current-sheet-related solar wind, which has been fractionated in the corona due to inefficient Coulomb drag.


Item Type:Article
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URLURL TypeDescription
https://doi.org/10.1007/s11214-007-9150-1DOIArticle
https://rdcu.be/bTqIcPublisherFree ReadCube access
ORCID:
AuthorORCID
Burnett, D. S.0000-0001-9521-8675
Wieler, R.0000-0001-5666-7494
Additional Information:© 2007 Springer Science+Business Media, Inc. Received: 20 December 2006; Accepted: 1 February 2007; Published online: 22 March 2007. We would like to thank R.A. Mewaldt, G.M. Mason, C.M.S. Cohen, R.A. Leske, and M.E.Wiedenbeck for providing suprathermal fluence data from ACE, F. Bühler for valuable discussions, and S. Tosatti and O.J. Homan for XPS and plasma cleaning of the BMG. We also would like to thank the entire Genesis team. This work was supported by the Swiss National Science Foundation and NASA.
Funders:
Funding AgencyGrant Number
Swiss National Science Foundation (SNSF)UNSPECIFIED
NASAUNSPECIFIED
Subject Keywords:Sun: solar wind; Isotopic abundance ratios; Methods: laboratory
Issue or Number:1-4
Record Number:CaltechAUTHORS:20100910-112210816
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20100910-112210816
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19867
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:10 Sep 2010 21:24
Last Modified:09 Mar 2020 13:19

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