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Constraints on Neon and Argon Isotopic Fractionation in Solar Wind

Meshik, Alex and Mabry, Jennifer and Hohenberg, Charles and Marrocchi, Yves and Pravdivtseva, Olga and Burnett, Donald and Olinger, Chad and Wiens, Roger and Reisenfeld, Dan and Allton, Judith and McNamara, Karen and Stansbery, Eileen and Jurewicz, Amy J. G. (2007) Constraints on Neon and Argon Isotopic Fractionation in Solar Wind. Science, 318 (5849). pp. 433-435. ISSN 0036-8075. doi:10.1126/science.1145528.

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To evaluate the isotopic composition of the solar nebula from which the planets formed, the relation between isotopes measured in the solar wind and on the Sun's surface needs to be known. The Genesis Discovery mission returned independent samples of three types of solar wind produced by different solar processes that provide a check on possible isotopic variations, or fractionation, between the solar-wind and solar-surface material. At a high level of precision, we observed no significant inter-regime differences in ^(20)Ne/^(22)Ne or ^(36)Ar/^(38)Ar values. For ^(20)Ne/^(22)Ne, the difference between low- and high-speed wind components is 0.24 ± 0.37%; for ^(36)Ar/^(38)Ar, it is 0.11 ± 0.26%. Our measured ^(36)Ar/^(38)Ar ratio in the solar wind of 5.501 ± 0.005 is 3.42 ± 0.09% higher than that of the terrestrial atmosphere, which may reflect atmospheric losses early in Earth's history.

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URLURL TypeDescription DOIArticle
Burnett, Donald0000-0001-9521-8675
Wiens, Roger0000-0002-3409-7344
Reisenfeld, Dan0000-0003-1874-9450
Jurewicz, Amy J. G.0000-0002-3282-5782
Additional Information:© 2007 American Association for the Advancement of Science. Received for publication 22 May 2007; Accepted for publication 31 August 2007. We acknowledge the support of the entire Genesis team in enabling this work. Portions of this work at Washington Univ. were supported by NASA grants (NNJ04HI17G and NAG5-12885).
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Issue or Number:5849
Record Number:CaltechAUTHORS:20121120-142339436
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35582
Deposited By: Jason Perez
Deposited On:20 Nov 2012 23:57
Last Modified:09 Nov 2021 23:16

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