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Héliosismologie et Astrométrie solaire à haute résolution

Abstract : Research in solar and stellar physics has been tremendously influenced these past decades by the use of seismic techniques that allowed us for the first time to explore the interior of stars. For the Sun, it is possible to go even further with high resolution and high cadence imaging. Thus, since the years 2000 a new field as emerged called “local helioseismology” that gives us the ability to probe in details and in quasi real time the most superficial layers beneath the solar photosphere. The first part of this document reports my activities and contribution in the field of local helioseismology. I show how I actively contributed to the development of the numerical tools that were needed to analyze the new high resolution images provided by the American ground-based network GONG and the NASA/ESA S0HO spacecraft. Then, I worked to set new constraints on the Kinematic flux transport solar dynamo models by studying the meridional circulation, active zones dynamics or the torsional oscillations of the rotation rate. This led me to contribute to the debate on the seat of the solar dynamo and the various characteristics of its main components. In the second part, I present my contribution to the development of the new solar astrometry facility PICARD-SOL that was set up at Calern observatory (OCA) in the framework of the space mission PICARD dedicated to the measurement and monitoring of the solar diameter. Solar astrometry from direct high resolution imaging has replaced the traditional astrolabe technics and has raised new challenges in order to take into account turbulence and astronomical refraction effects in ground based data analysis. My future work is then placed in perspective within the framework of the new instrumental projects and the development of space weather.
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Thierry Corbard. Héliosismologie et Astrométrie solaire à haute résolution. Astrophysique stellaire et solaire [astro-ph.SR]. Université Côte D'Azur, 2016. ⟨tel-02466222⟩

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