Magnesium isotopes of the bulk solar wind from Genesis diamond-like carbon films
- Arizona State Univ., Tempe, AZ (United States). Center for Meteorite Studies; DOE/OSTI
- New Mexico Consortium, Los Alamos, NM (United States)
- Arizona State Univ., Tempe, AZ (United States). School of Earth and Space Exploration
- California Institute of Technology (CalTech), Pasadena, CA (United States). Dept. of Geology and Planetary Sciences
- GET‐NSA, LLC, Germantown, MD (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States). (Remote Sensing) ISR‐2
- Naval Research Lab., Washington, DC (United States). Space Science Division Code
- Univ. of Hawaii at Manoa, Honolulu, HI (United States). Hawaii Inst. of Geophysics and Planetology
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Arizona State Univ., Tempe, AZ (United States). School of Molecular Sciences
–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 2σ 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).
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1625907
- Journal Information:
- Meteoritics and Planetary Science, Journal Name: Meteoritics and Planetary Science Journal Issue: 2 Vol. 55; ISSN 1086-9379
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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