What Can We Learn From the Sun's Interior Useful for Understanding Solar-Terrestrial Links?

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The baryonic Universe is mainly composed by plasma and so, magnetism plays a fundamental role. However, magnetism is still poorly known. Equations of magnetic field are not yet taken into account in all the equations describing our Universe, and in particular in stellar (and solar) equations. Nevertheless, it is known that the magnetism of the solar interior has a key role. Understanding this role will permit also to understand better our terrestrial climate, as all the interplanetary medium is bathing into this magnetic field. New results from various space and ground-based experiments monitoring the radiative and particle emissions of the Sun, together with their movement in space and their terrestrial impact, have opened a new era in both solar and atmospheric physics. These studies clearly show that the variable solar radiative and particle output affects the Earth's atmosphere and climate in many fundamental ways. The main goal of this paper is to emphasize the Sun as a unique object for which we may hope a quantitative approach before generalization to other more energetic objects. The slow and organized activity of the Sun is not a superficial phenomenon: it implies the core, where most of the mass is concentrated, and we are still far to control mechanisms (rotation, spin,& ). The surface manifestation of the irradiance might be not only a surface manifestation of the magnetic activity, and could take its origin in deeper layers. Some dedicated space joint missions, such as SDO, GOLF-NG or PICARD will help us to make significant progresses on this way.

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