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Magnesium isotopes of the bulk solar wind from Genesis diamond‐like carbon films

Jurewicz, A. J. G. and Rieck, K. D. and Hervig, R. and Burnett, D. S. and Wadhwa, M. and Olinger, C. T. and Wiens, R. C. and Laming, J. M. and Guan, Y. and Huss, G. R. and Reisenfeld, D. B. and Williams, P. (2020) Magnesium isotopes of the bulk solar wind from Genesis diamond‐like carbon films. Meteoritics and Planetary Science, 55 (2). pp. 352-375. ISSN 1086-9379. PMCID PMC7079557. doi:10.1111/maps.13439.

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NASA's Genesis Mission returned solar wind (SW) to the Earth for analysis to derive the composition of the solar photosphere from solar material. SW analyses control the precision of the derived solar compositions, but their ultimate accuracy is limited by the theoretical or empirical models of fractionation due to SW formation. Mg isotopes are “ground truth” for these models since, except for CAIs, planetary materials have a uniform Mg isotopic composition (within ≤1‰) so any significant isotopic fractionation of SW Mg is primarily that of SW formation and subsequent acceleration through the corona. This study analyzed Mg isotopes in a bulk SW diamond‐like carbon (DLC) film on silicon collector returned by the Genesis Mission. A novel data reduction technique was required to account for variable ion yield and instrumental mass fractionation (IMF) in the DLC. The resulting SW Mg fractionation relative to the DSM‐3 laboratory standard was (−14.4‰, −30.2‰) ± (4.1‰, 5.5‰), where the uncertainty is 2ơ SE of the data combined with a 2.5‰ (total) error in the IMF determination. Two of the SW fractionation models considered generally agreed with our data. Their possible ramifications are discussed for O isotopes based on the CAI nebular composition of McKeegan et al. (2011).

Item Type:Article
Related URLs:
URLURL TypeDescription CentralArticle
Jurewicz, A. J. G.0000-0002-3282-5782
Hervig, R.0000-0001-7892-5423
Burnett, D. S.0000-0001-9521-8675
Wadhwa, M.0000-0001-9187-1255
Olinger, C. T.0000-0002-9509-6345
Wiens, R. C.0000-0002-3409-7344
Laming, J. M.0000-0002-3362-7040
Guan, Y.0000-0002-7636-3735
Huss, G. R.0000-0003-4281-7839
Reisenfeld, D. B.0000-0003-1874-9450
Additional Information:© 2020 The Authors. Meteoritics & Planetary Science published by Wiley Periodicals, Inc. on behalf of The Meteoritical Society (MET). This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. Received 09 December 2018; revision accepted 10 December 2019. Version of Record online: 22 January 2020. SIMS analysis at Arizona State University National SIMS facility, was supported by EAR0622775. This work was initiated using Genesis Mission Funds, including JPL subcontract #1354958. Subsequent work was supported by NASA LARS Grants # NNX14AF26G and 80NSSC17K0025 (DSB, AJ); NNX17AE73G (GRH); NNH15AZ25I and NNH15AZ67I (RW); 80NSSC18K0740 (DBR), NNH16AC39I, NNH17AE96I, and NNH17AE60I (JML); as well as by basic research funds of the Chief of Naval Research (JML) and NASA Emerging Worlds award NNX15AH41G (MW). Thanks to J. Ziegler, USNA Annapolis for advice on SRIM, L. Williams for oversight using the ASU Cameca IMS 6f, Phil Janney for supporting M. Wadhwa in the Isotope Cosmochemistry and Geochronology Laboratory, and Stephen Romaniello for his discussions on Mg isotopes. Tom Friedmann provided significant insight into the material properties of the DLC made at Sandia National Laboratory. Bernard Marty and three anonymous reviewers made excellent suggestions that greatly improved the quality of this manuscript. Special thanks to associate editor Marc Caffee for his effort and patience.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Chief of Naval ResearchUNSPECIFIED
Issue or Number:2
PubMed Central ID:PMC7079557
Record Number:CaltechAUTHORS:20200206-112311510
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Official Citation:Jurewicz, A.J.G., Rieck, K.D., Hervig, R., Burnett, D.S., Wadhwa, M., Olinger, C.T., Wiens, R.C., Laming, J.M., Guan, Y., Huss, G.R., Reisenfeld, D.B. and Williams, P. (2020), Magnesium isotopes of the bulk solar wind from Genesis diamond‐like carbon films. Meteorit Planet Sci, 55: 352-375. doi:10.1111/maps.13439
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101158
Deposited By: Tony Diaz
Deposited On:06 Feb 2020 20:09
Last Modified:15 Feb 2022 23:49

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