Variability of the Sun's Luminosity Places Constraints on the Thermal Equilibrium of the Convection Zone - Archive ouverte HAL Access content directly
Journal Articles The Astrophysical Journal Supplement Series Year : 2022

Variability of the Sun's Luminosity Places Constraints on the Thermal Equilibrium of the Convection Zone

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1
L. E. A. Vieira
  • Function : Author
G. Kopp
  • Function : Author
L. A. da Silva
  • Function : Author
F. Carlesso
  • Function : Author
A. R. Barbosa
  • Function : Author
A. Muralikrishna
  • Function : Author
R. Santos
  • Function : Author

Abstract

Luminosity, which is the total amount of radiant energy emitted by an object, is one of the most critical quantities in astrophysics for characterizing stars. Equally important is the temporal evolution of a star's luminosity because of its intimate connection with the stellar energy budget, large-scale convective motion, and heat storage in the stellar interior. The Sun's luminosity and its variation have not been measured to date because current observations of the solar radiative output have been restricted to vantage points near the Earth. Here, we model the solar luminosity by extending a semiempirical total solar irradiance (TSI) model that uses solar-surface magnetism to reconstruct solar irradiance over the entire 4π solid angle around the Sun. This model was constrained by comparing its output to the irradiance in the Earth's direction with the measured TSI. Comparing the solar luminosity to the TSI on timescales from days to solar cycles for cycles 23 and 24, we find poor agreement on short timescales (
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Dates and versions

insu-03708680 , version 1 (29-06-2022)

Licence

Attribution - CC BY 4.0

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L. E. A. Vieira, G. Kopp, Thierry Dudok de Wit, L. A. da Silva, F. Carlesso, et al.. Variability of the Sun's Luminosity Places Constraints on the Thermal Equilibrium of the Convection Zone. The Astrophysical Journal Supplement Series, 2022, 260, ⟨10.3847/1538-4365/ac626d⟩. ⟨insu-03708680⟩
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