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Helioseismic Constraints on the Solar Structure: Evidences of Element Segregation and Mild Mixing Below the Convection Zone

Published online by Cambridge University Press:  08 February 2017

S. Vauclair
S. Vauclair*
Affiliation:
Laboratoire d‘Astrophysique de Toulouse, 14, avenue Edouard-Belin, 31400-Toulouse, France

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The study of the internal structure of the Sun entered a new age with helioseismology. Several ground based networks, as well as the space mission SoHO, continuously observe the solar oscillations. In particular GONG, the “Global Oscillation Network Project”, gathers six sites around the world with six identical Doppler instruments. These instruments observe the phase shift of the Ni 676.8nm line with 3 images every minute, 1.8 sites observing simultaneously. Millions of solar p-modes have been detected. The inversion of the measured frequencies yields accurate and detailed information about the sound velocity in the Sun's interior, which in turn leads to constraints on the equation of state, opacities, chemical composition. Precise informations on the differential rotation inside the Sun have also been obtained. (See the special Science issue on GONG, vol 272, 31 May 1996).

Type
III. Large-Scale Structure of the Sun
Information
Symposium - International Astronomical Union , Volume 185: New Eyes to See Inside the Sun and Stars , 1998 , pp. 135 - 140
Copyright
Copyright © Kluwer 1998 

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