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• W3103117002 abstract "Aims. We seek to derive information on the temperature structure of the solar chromosphere and compare these results with existing models.Methods. We measured the center-to-limb variation of the brightness temperature, T b , from ALMA full-disk images at two frequencies and inverted the solution of the transfer equation to obtain the electron temperature, T e as a function of optical depth, τ .Results. The ALMA images are very similar to AIA images at 1600 A. The brightness temperature at the center of the disk is 6180 and 7250 K at 239 and 100 GHz, respectively, with dispersions of 100 and 170 K. Plage regions stand out clearly in the 239/100 GHz intensity ratio, while faculae and filament lanes do not. The solar disk radius, reduced to 1 AU, is 961.1 ± 2.5′′ and 964.1 ± 4.5′′ at 239 and 100 GHz, respectively. A slight but statistically significant limb brightening is observed at both frequencies.Conclusions. The inversion of the center-to-limb curves shows that T e varies linearly with the logarithm of optical depth for 0.34 100 GHz e / dlnτ = −608 K. Our results are 5% lower than predicted by the average quiet Sun model C of Fontenla et al. (, ApJ, 406, 319), but do not confirm previous reports that the mm-λ solar spectrum is better fitted with models of the cell interior." @default.
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• W3103117002 date "2017-09-01" @default.
• W3103117002 modified "2023-09-23" @default.
• W3103117002 title "Center-to-limb observations of the Sun with ALMA - Implications for solar atmospheric models" @default.
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