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New Solar Metallicity Measurements

1,2,†
1
The Oskar Klein Centre for Cosmoparticle Physics, Department of Physics, Stockholm University, AlbaNova Universitetscentrum, Roslagstullsbacken 21A, SE-106 91 Stockholm, Sweden
2
The Nordic Institute for Theoretical Physics (NORDITA), Roslagstullsbacken 23, SE-106 91 Stockholm, Sweden
This paper is an extended version of our paper published in 51st Rencontres de Moriond, Cosmology Session.
Atoms 2019, 7(2), 41; https://doi.org/10.3390/atoms7020041
Received: 5 March 2019 / Revised: 27 March 2019 / Accepted: 2 April 2019 / Published: 4 April 2019
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PDF [245 KB, uploaded 11 May 2019]

Abstract

In the past years, a systematic downward revision of the metallicity of the Sun has led to the “solar modeling problem”, namely the disagreement between predictions of standard solar models and inferences from helioseismology. Recent solar wind measurements of the metallicity of the Sun, however, provide once more an indication of a high-metallicity Sun. Because of the effects of possible residual fractionation, the derived value of the metallicity Z = 0.0196 ± 0.0014 actually represents a lower limit to the true metallicity of the Sun. However, when compared with helioseismological measurements, solar models computed using these new abundances fail to restore agreement, owing to the implausibly high abundance of refractory (Mg, Si, S, Fe) elements, which correlates with a higher core temperature and hence an overproduction of solar neutrinos. Moreover, the robustness of these measurements is challenged by possible first ionization potential fractionation processes. I will discuss these solar wind measurements, which leave the “solar modeling problem” unsolved. View Full-Text
Keywords: solar metallicity; solar wind; solar modeling problem solar metallicity; solar wind; solar modeling problem
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Vagnozzi, S. New Solar Metallicity Measurements. Atoms 2019, 7, 41.

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