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CALAS, une caméra pour l'étude des grandes échelles de la surface solaire

Abstract : The purpose of the CALAS project is the study of supergranulation, a large scale pattern on the photosphere. The origin of supergranulation is still quite controversed and needs observations with very high spatial resolution on a wide field of view. The CALAS project is an answer to those requirements by building a camera with large field and high resolution, installed at Lunette Jean Rösch, a 50cm refractor on top of Pic du Midi. This camera uses CMOS sensors which advantages are the reading speed, the low cost and large dimensions available.
We made a complete acquisition syste: the camera and its control and reading electronics with its acquiring software, along with a suitable disk system for the large amount of data.
The other part of the project was to design an optical bench on two optical channels allowing the observation of the solar surface both with imagery and with Doppler and magnetography, using magneto-optical filters. Part of the work also consisted in adapting and improving Lunette Jean Rösch.
During this project I made numerous observing missions at LJR and also participated a Joint Observing Programwhich purpose was the study of the photospheric flows in the vincinity of filaments.
At the end of this thesis, the first large field and high resolution observationsof the photosphere have been made at Lunette Jean Rösch, and their quality is quite promising for the next scientific use.
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Submitted on : Friday, May 4, 2007 - 3:06:31 PM
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  • HAL Id : tel-00144722, version 1



Sylvain Rondi. CALAS, une caméra pour l'étude des grandes échelles de la surface solaire. Astrophysique [astro-ph]. Université Paul Sabatier - Toulouse III, 2006. Français. ⟨tel-00144722⟩



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