On the hydrostatic stratification of the solar tachocline
| Autor: | Douglas Gough, Jørgen Christensen-Dalsgaard, Emil Knudstrup |
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| Rok vydání: | 2018 |
| Předmět: |
Opacity
OPACITIES MODELS Stratification (water) FOS: Physical sciences Tachocline CHEMICAL-COMPOSITION 01 natural sciences law.invention abundances [Sun] law 0103 physical sciences Radiative transfer helioseismology [Sun] 010306 general physics 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Physics SOUND-SPEED interior [Sun] CONSTRAINTS Astronomy and Astrophysics Mechanics EQUATION-OF-STATE INTERIOR Radiative equilibrium HELIOSEISMOLOGY Convection zone Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Hydrostatic equilibrium ABUNDANCE ANALYSIS Convective overshoot CONVECTION ZONE |
| Zdroj: | Christensen-Dalsgaard, J, Gough, D O & Knudstrup, E 2018, ' On the hydrostatic stratification of the solar tachocline ', Monthly Notices of the Royal Astronomical Society, vol. 477, no. 3, pp. 3845-3852 . https://doi.org/10.1093/mnras/sty752 |
| DOI: | 10.48550/arxiv.1803.08675 |
| Popis: | We present an attempt to reconcile the solar tachocline glitch, a thin layer immediately beneath the convection zone in which the seismically inferred sound speed in the Sun exceeds corresponding values in standard solar models, with a degree of partial material mixing which we presume to have resulted from a combination of convective overshoot, wave transport and tachocline circulation. We first summarize the effects of either modifying in the models the opacity in the radiative interior or of incorporating either slow or fast tachocline circulation. Neither alone is successful. We then consider, without physical justification, incomplete material redistribution immediately beneath the convection zone which is slow enough not to disturb radiative equilibrium. It is modelled simply as a diffusion process. We find that, in combination with an appropriate opacity modification, it is possible to find a density-dependent diffusion coefficient that removes the glitch almost entirely, with a radiative envelope that is consistent with seismology. Comment: Mon. Not. R. Astr. Soc., in the press |
| Databáze: | OpenAIRE |
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