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Astrométrie solaire à haute résolution, Spectre solaire à haute résolution, et Influence du Soleil sur le climat

Mustapha Meftah 1
1 STRATO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : The role of solar variability in climate evolution remains a topic of considerable scientific and societal importance. To understand the recent evolution of the past climate and to project oneself in the future need to be able to distinguish between the climatic variations of anthropic origin and the natural variations, in particular of solar origin. The overall scientific objective pursued in the context of my research is to improve our knowledge of the Sun (diameter and solar spectrum) and to better estimate the impact of solar forcing on climate. The implementation of scientific instruments and the use of data from different types of observation (ground, in situ, satellite) are the main tools used. The implemented approach relies on the development of scientific instruments and the exploitation of associated data. My main research interests are in high resolution solar astrometry and high resolution solar spectrum. For a long time, we wondered about a possible relationship between solar diameter, solar activity and climate. Today, the absolute value of the diameter of our star represents above all an interest in stellar astronomy. Knowing the solar diameter with the greatest accuracy is essential to know if our star is stable in time. Variations in solar diameter reflect processes that are still poorly understood and can be associated with the cycle of magnetic activity below the Sun’s surface. In addition, I am working on the long-term monitoring of the solar spectral irradiance variations. Accurate measurement of the solar spectrum at the top of the atmosphere and its variability over time are fundamental inputs for solar physics, terrestrial atmospheric photochemistry, and Earth’s climate. My research perspectives are on the influence of the Sun on the climate. I am interested in solar variability and its effect on the Earth’s climate at global and regional scale. Several mechanisms have been proposed to describe the influence of solar variability on the climate but their effectiveness is not clearly established. The idea is to better estimate the impact of solar forcing on climate. Indeed, I am interested in the measurement of the radiative budget of the Earth and its energy imbalance. The idea is to obtain information that can help to constrain poorly known radiative forcings (aerosols, interactions with aerosols, total solar irradiance, UV spectral irradiance, etc.) and to reveal the future direction of climate change. For this, I am working on the development of a small satellite dedicated to the measurement of the radiative budget of the Earth.
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Mustapha Meftah. Astrométrie solaire à haute résolution, Spectre solaire à haute résolution, et Influence du Soleil sur le climat. Astrophysique stellaire et solaire [astro-ph.SR]. Université Versailles Saint Quentin en Yvelines, 2019. ⟨tel-02293842⟩

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