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Effets de la Turbulence Atmosphérique lors de l'Observation du Soleil à Haute Résolution Angulaire

Abstract : The observation of the Sun at high angular resolution is of great importance in astronomy. In this context, I show the effects of optical turbulence on solar images, especially on the astrometric long exposure measurements of the solar diameter. I propose a modelling, in the small perturbation approximation, of the chromatic and polychromatic local angle of arrival fluctuations, which has direct relevance for optical turbulence daytime observations. In order to extract angle of arrival fluctuations from short exposure images of solar edge, I propose an effective and stable method that consists of a photometric integration with local anisoplanatism test. This method increases the efficiency of previous approaches. It also impacts on the long exposure measurement of the solar diameter as well as on the definition of solar photometric diameter. Another way to measure daytime angle of arrival fluctuations is to do so in the pupil plane. I studied this approach with its validity and limitations. As a direct application, we propose a concept of a profiling monitor for the low altitude optical turbulence. Another important part of my work has been the modelling of the temporal variation of optical turbulence by introducing proper boiling. The theoretical framework that I propose is presented with examples (interferometry, adaptive optics...) related to various high angular resolution observation techniques in the presence of optical turbulence.
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Submitted on : Monday, April 7, 2008 - 4:44:04 PM
Last modification on : Tuesday, December 7, 2021 - 4:04:04 PM
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  • HAL Id : tel-00270872, version 1



Amokrane Berdja. Effets de la Turbulence Atmosphérique lors de l'Observation du Soleil à Haute Résolution Angulaire. Autre. Université Nice Sophia Antipolis, 2007. Français. ⟨tel-00270872⟩



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