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Inversion des mesures héliosismiques: la rotation interne du Soleil

Abstract : This work presents a study of the internal rotation of the Sun, from the core up to surface layers, as inferred from helioseismic observations. The Sun is at the moment the only star for which one can learn about its internal dynamics from observations. This represents a test for the theories of angular momentum evolution and thus for all the physical process involved in these theories. I present first the theoretical aspects that allow us to make the link between the observation of the global oscillations of the Sun and its internal rotation. Then I give the principal inverse methods used to infer the rotation from the observations and the tools for the interpretation of the results. I use in this work several ground based observations or spatial data coming from instruments on board SoHO launched in 1995. I develop a new regularized least square code that insure the regularity of the solution in the core and that allow surfaces constraints to be taken into account. The analysis of various observations by means of this code shows a quasi solid rotation in the radiative interior and a latitudinal dependent rotation in the convection zone. The shear layer named tachocline between these two regimes and the core rotation require specific treatments. For the study of the tachocline, I develop a non linear method that can preserve the high rotational gradients that occur in this zone. This approach, used for the first time in helioseismic context, leads to a thin tachocline located beneath the convection zone and thus represents a constraint for the theoretical studies of this zone. Finally, the results reached from various data do not allow to conclude de nitively concerning the deepest layers but show that the current observations are in good agreement with a rigid rotation from the base of the tachocline down to 0.2 solar radius.
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Thierry Corbard. Inversion des mesures héliosismiques: la rotation interne du Soleil. Astrophysique stellaire et solaire [astro-ph.SR]. Université de Nice Sophia-Antipolis, 1998. Français. ⟨NNT : 1998NICE5237⟩. ⟨tel-02921925⟩

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