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• W2017193313 abstract "We investigate systematic uncertainties in determining the profiles of the solar sound speed, density, and adiabatic index using helioseismological techniques. We find that rms uncertainties (averaged over the Sun) of ~0.02%-0.04% are contributed to the sound-speed profile by each of three sources: (1) the choice of assumed reference model, (2) the width of the inversion kernel, and (3) the measurement errors. The rms agreement between the standard solar model sound speeds and the best helioseismological determinations is about 0.07%. The profile of the adiabatic index, Γ1, is determined to an accuracy of about 0.02% with the Michelson Doppler Imager (MDI) data set. The density profile is about an order of magnitude less well determined by the helioseismological measurements. Five state-of-the-art models, each with a significant difference in the input physics or a parameter choice, all give comparably good agreement with global helioseismological measurements. We consider four deficient solar models that are constructed either using old input data, assuming the 3He + 4He fusion reaction does not occur, neglecting element diffusion, or artificially mixing the interior of the Sun. When used as reference models in the inversion process, these deficient models yield sound speeds for the Sun that differ only by 0.1% from the sound speeds obtained using the standard model. We conclude that even relatively crude reference models yield reasonably accurate solar parameters. Although acceptable for most purposes as reference models, nonstandard solar models in which the core is artificially mixed or in which element diffusion is neglected are strongly disfavored by the p-mode oscillation data. These nonstandard models produce sound-speed profiles with respect to the Sun that are 4.5 and 18 times worse, respectively, than the agreement obtained with the standard solar model." @default.
• W2017193313 created "2016-06-24" @default.
• W2017193313 creator A5071573101 @default.
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• W2017193313 date "2000-02-01" @default.
• W2017193313 modified "2023-09-23" @default.
• W2017193313 title "How Much Do Helioseismological Inferences Depend on the Assumed Reference Model?" @default.
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• W2017193313 doi "https://doi.org/10.1086/308302" @default.
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