Hydrogen fluence in Genesis collectors: Implications for acceleration of solar wind and for solar metallicity

1Gary R. Huss,1Elizabeth Koeman‐Shields,2Amy J. G. Jurewicz,3Donald S. Burnett,1Kazuhide Nagashima,4Ryan Ogliore,5Chad T. Olinger
Meteoritics & Planetary Science (in Press) Link to Article [https://doi.org/10.1111/maps.13420]
1Hawai‘i Institute of Geophysics and Planetology, University of Hawai‘i at Mānoa, 1680 East‐West Road, POST 504, Honolulu, Hawai‘i, 96822 USA
2Center for Meteorite Studies, Arizona State University, 781 E. Terrace Rd, ISTB4‐m/c 6004, Tempe, Arizona, 85287‐6004 USA
3Division of Geological and Planetary Science, California Institute of Technology, Mail Code 100‐23, 1200 E. California Blvd., Pasadena, California, 91125 USA
4Department of Physics, Washington University in St. Louis, One Brookings Drive, St. Louis, Missouri, 63130 USA
5GET‐NSA, LLC, AU‐62, 19901 Germantown Rd, Germantown, Maryland, 20875 USA
Published by arrangement with John Wiley & Sons

NASA’s Genesis mission was flown to capture samples of the solar wind and return them to the Earth for measurement. The purpose of the mission was to determine the chemical and isotopic composition of the Sun with significantly better precision than known before. Abundance data are now available for noble gases, magnesium, sodium, calcium, potassium, aluminum, chromium, iron, and other elements. Here, we report abundance data for hydrogen in four solar wind regimes collected by the Genesis mission (bulk solar wind, interstream low‐energy wind, coronal hole high‐energy wind, and coronal mass ejections). The mission was not designed to collect hydrogen, and in order to measure it, we had to overcome a variety of technical problems, as described herein. The relative hydrogen fluences among the four regimes should be accurate to better than ±5–6%, and the absolute fluences should be accurate to ±10%. We use the data to investigate elemental fractionations due to the first ionization potential during acceleration of the solar wind. We also use our data, combined with regime data for neon and argon, to estimate the solar neon and argon abundances, elements that cannot be measured spectroscopically in the solar photosphere.

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