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Depth profiling analysis of solar wind helium collected in diamond-like carbon film from Genesis

Bajo, Ken-ichi and Olinger, Chad T. and Jurewicz, Amy J. G. and Burnett, Donald S. and Sakaguchi, Isao and Suzuki, Taku and Itose, Satoru and Ishihara, Morio and Uchino, Kiichiro and Wieler, Rainer and Yurimoto, Hisayoshi (2015) Depth profiling analysis of solar wind helium collected in diamond-like carbon film from Genesis. Geochemical Journal, 49 (5). pp. 559-566. ISSN 0016-7002.

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The distribution of solar-wind ions in Genesis mission collectors, as determined by depth profiling analysis, constrains the physics of ion-solid interactions involving the solar wind. Thus, they provide an experimental basis for revealing ancient solar activities represented by solar-wind implants in natural samples. We measured the first depth profile of ^4He in a Genesis collector; the shallow implantation (peaking at <20 nm) required us to use sputtered neutral mass spectrometry with post-photoionization by a strong field. The solar wind He fluence calculated using depth profiling is ~8.5 × 10^(14) cm^(–2). The shape of the solar wind 4He depth profile is consistent with TRIM simulations using the observed ^4He velocity distribution during the Genesis mission. It is therefore likely that all solar-wind elements heavier than H are completely intact in this Genesis collector and, consequently, the solar particle energy distributions for each element can be calculated from their depth profiles. Ancient solar activities and space weathering of solar system objects could be quantitatively reproduced by solar particle implantation profiles.

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Additional Information:© 2015 by The Geochemical Society of Japan. Received January 23, 2015; Accepted June 30, 2015. We thank Hajime Hiyagon and an anonymous reviewer for their constructive reviews and suggestions and Yuji Sano for his kind editorial advice. This study is supported in part by Monka-sho grants. This is a contribution to Los Alamos publication LA-UR-15-21508.
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Subject Keywords:solar wind, depth profile, helium, NASA Genesis mission, post-ionization
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Los Alamos National LaboratoryLA-UR-15-21508
Issue or Number:5
Record Number:CaltechAUTHORS:20151105-124452080
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:61903
Deposited By: Tony Diaz
Deposited On:05 Nov 2015 23:47
Last Modified:03 Oct 2019 09:13

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