The dynamics of the solar core with SoHO/GOLF
Abstract
We will present the latest results of the search for solar gravity modes and the solar core rotation with the GOLF instrument (aboard SoHO). The gravity modes are a primary target of the GOLF instrument. They are of great interest for the knowledge of the solar core and the physical phenomena that occur inside (pressure and density stratification, rotation profile, magnetic field, screening effect of the nuclear reactions...) We will describe the strategy developed at Saclay to detect them and the results we obtain. We find some candidates and put some constraints on their amplitude. Such amplitudes are important to better know the g-mode excitation mechanisms. We will also show the solar rotation profile for the solar interior (as deep as 0.2 R) derived with the latest SoHO data. The knowledge of this profile is needed to put some constraints on the angular momentum distribution and the related mechanisms. It is also needed to explain the oblateness of the Sun and have some information about a possible magnetic field in the core. The rotation rate derived favors a rigidly rotating radiative zone with a rate close to the one of the outer radiative zone, although we might have found some hints for a decrease of the rotation rate near the very center of the Sun.
- Publication:
-
SF2A-2002: Semaine de l'Astrophysique Francaise
- Pub Date:
- June 2002
- Bibcode:
- 2002sf2a.conf..441C