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Heavy noble gases in solar wind delivered by Genesis mission

Meshik, Alex and Hohenberg, Charles and Pravdivtseva, Olga and Burnett, Donald (2014) Heavy noble gases in solar wind delivered by Genesis mission. Geochimica et Cosmochimica Acta, 127 . pp. 326-347. ISSN 0016-7037. PMCID PMC5688518. doi:10.1016/j.gca.2013.11.030.

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One of the major goals of the Genesis Mission was to refine our knowledge of the isotopic composition of the heavy noble gases in solar wind and, by inference, the Sun, which represents the initial composition of the solar system. This has now been achieved with permil precision: ^(36)Ar/^(38)Ar = 5.5005 ± 0.0040, ^(86)Kr/^(84)Kr = .3012 ± .0004, ^(83)Kr/^(84)Kr = .2034 ± .0002, ^(82)Kr/^(84)Kr = .2054 ± .0002, ^(80)Kr/^(84)Kr = .0412 ± .0002, ^(78)Kr/^(84)Kr = .00642 ± .00005, ^(136)Xe/^(132)Xe = .3001 ± .0006, ^(134)Xe/^(132)Xe = .3691 ± .0007, ^(131)Xe/^(132)Xe = .8256 ± .0012, ^(130)Xe/^(132)Xe = .1650 ± .0004, ^(129)Xe/^(132)Xe = 1.0405 ± .0010, ^(128)Xe/^(132)Xe = .0842 ± .0003, ^(126)Xe/^(132)Xe = .00416 ± .00009, and ^(124)Xe/^(132)Xe = .00491 ± .00007 (error-weighted averages of all published data). The Kr and Xe ratios measured in the Genesis solar wind collectors generally agree with the less precise values obtained from lunar soils and breccias, which have accumulated solar wind over hundreds of millions of years, suggesting little if any temporal variability of the isotopic composition of solar wind krypton and xenon. The higher precision for the initial composition of the heavy noble gases in the solar system allows (1) to confirm that, exept ^(136)Xe and ^(134)Xe, the mathematically derived U–Xe is equivalent to Solar Wind Xe and (2) to provide an opportunity for better understanding the relationship between the starting composition and Xe-Q (and Q-Kr), the dominant current “planetary” component, and its host, the mysterious phase-Q.

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Burnett, Donald0000-0001-9521-8675
Additional Information:© 2013 Elsevier Ltd. Received 11 April 2013; accepted in revised form 23 November 2013; available online 7 December 2013. Associate editor: Gregory F. Herzog. We are grateful to Judy Allton, Patti Burkett, Wally Calaway, Amy Jurewicz, Karen McNamara,Melissa Rodriguez (Genesis Science team) and John Saxton and Phil Freedman (Nu Instruments) for their support. We thank Gregory Herzog, Kurt Marti, Robert Pepin and Jamie Gilmour for their valuable comments. This work is funded by NASA Grants NNX09AC57G and NNX13AD14G.
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PubMed Central ID:PMC5688518
Record Number:CaltechAUTHORS:20140225-102334485
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Official Citation:Alex Meshik, Charles Hohenberg, Olga Pravdivtseva, Donald Burnett, Heavy noble gases in solar wind delivered by Genesis mission, Geochimica et Cosmochimica Acta, Volume 127, 15 February 2014, Pages 326-347, ISSN 0016-7037, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43977
Deposited By: Ruth Sustaita
Deposited On:25 Feb 2014 19:07
Last Modified:10 Nov 2021 16:46

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