Title: Magnesium isotopes of the bulk solar wind from Genesis diamond-like carbon films

Journal Article · · Meteoritics and Planetary Science
DOI: https://doi.org/10.1111/maps.13439 · OSTI ID:1625907
ORCiD logo [1];  [2]; ORCiD logo [3];  [4]; ORCiD logo [3]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7];  [4]; ORCiD logo [8];  [9];  [10]
  1. Arizona State Univ., Tempe, AZ (United States). Center for Meteorite Studies; DOE/OSTI
  2. New Mexico Consortium, Los Alamos, NM (United States)
  3. Arizona State Univ., Tempe, AZ (United States). School of Earth and Space Exploration
  4. California Institute of Technology (CalTech), Pasadena, CA (United States). Dept. of Geology and Planetary Sciences
  5. GET‐NSA, LLC, Germantown, MD (United States)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). (Remote Sensing) ISR‐2
  7. Naval Research Lab., Washington, DC (United States). Space Science Division Code
  8. Univ. of Hawaii at Manoa, Honolulu, HI (United States). Hawaii Inst. of Geophysics and Planetology
  9. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  10. 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

References (46)

Large-scale globally propagating coronal waves text January 2015
Minor ions in the solar wind text January 2007
Processes affecting abundances in the solar wind journal January 1982
The FIP and Inverse FIP Effects in Solar and Stellar Coronae journal September 2015
Minor ions in the solar wind journal November 2006
Understanding heterogeneity in Genesis diamond-like carbon film using SIMS analysis of implants journal July 2017
Elemental Abundances of the Bulk Solar Wind: Analyses from Genesis and ACE journal July 2007
Solar Wind Conditions and Composition During the Genesis Mission as Measured by in situ Spacecraft journal February 2013
Implantation and ion beam mixing in thin film analysis journal April 1981
SIMS analysis of oxygen isotopes: matrix effects in complex minerals and glasses journal June 1997
Electrical and optical properties of diamond-like carbon journal November 1999
Limits of the efficiency of isotope fractionation processes in the solar wind derived from the magnesium isotopic composition as observed with the WIND/MASS experiment journal January 1997
Post-growth modification of amorphous carbon films under ion beam bombardment: Grain size dependence on the film thickness journal February 1998
Diamond-like amorphous carbon journal May 2002
Sputter yields in diamond bombarded by ultra low energy ions journal July 2006
Calculation of radiogenic 26Mg of CAI minerals under high precision isotope measurement by SIMS journal December 2008
Investigation of radiation enhanced diffusion of magnesium in substrates flown on the NASA genesis mission journal December 2008
Accurate analysis of shallowly implanted solar wind ions by SIMS backside depth profiling journal December 2014
Changes in chemical bonding of diamond-like carbon films by atomic-hydrogen exposure journal November 2010
Solar and solar-wind isotopic compositions journal June 2004
Characterization of amorphous and nanocrystalline carbon films journal April 2006
Helioseismology and solar abundances journal March 2008
Minor Ions in the solar Wind journal January 1988
Influence of Coulomb collisions on isotopic and elemental fractionation in the solar wind acceleration process journal January 2000
Abundances and charge states of particles in the solar wind journal May 2000
Possible in situ tests of the evolution of elemental and isotopic abundances in the solar convection zone: SOLAR CHEMICAL EVOLUTION journal December 2002
Magnesium isotope ratios in natural samples journal February 1966
High-precision Mg-isotope measurements of terrestrial and extraterrestrial material by HR-MC-ICPMS—implications for the relative and absolute Mg-isotope composition of the bulk silicate Earth journal January 2011
Disparity among low first ionization potential elements journal November 2018
Plasma ion implantation of nitrogen into silicon: Characterization of the depth profiles of implanted ions journal November 1994
Hydrogen migration in diamond-like carbon films journal October 1997
Constraining Solar Abundances Using Helioseismology journal April 2004
ISOTOPIC MASS FRACTIONATION OF SOLAR WIND: EVIDENCE FROM FAST AND SLOW SOLAR WIND COLLECTED BY THE GENESIS MISSION journal October 2012
VARIATIONS IN SOLAR WIND FRACTIONATION AS SEEN BY ACE /SWICS AND THE IMPLICATIONS FOR GENESIS MISSION RESULTS journal October 2015
Ion Implants as Matrix-Appropriate Calibrators for Geochemical Ion Probe Analyses journal January 2015
The Genesis solar wind sample return mission: Past, present, and future journal December 2013
The future of Genesis science journal February 2019
The Oxygen Isotopic Composition of the Sun Inferred from Captured Solar Wind journal June 2011
A 15N-Poor Isotopic Composition for the Solar System As Shown by Genesis Solar Wind Samples journal June 2011
Temperature effect on the formation of a relief of diamond-like carbon coatings and its modification by ion bombardment journal December 2006
The Electronic Transport Mechanism in Amorphous Tetrahedrally-Coordinated Carbon Films journal January 1997
Element Abundances: A New Diagnostic for the Solar Wind journal July 2019
Determining the Elemental and Isotopic Composition of the Pre-solar Nebula from Genesis Data Analysis: The Case of Oxygen journal December 2017
Helioseismology and Solar Abundances text January 2007
The FIP and Inverse FIP Effects in Solar and Stellar Coronae text January 2015
Element Abundances: A New Diagnostic for the Solar Wind text January 2019