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Progress in Physics
Sunspots and faculae are related phenomena and constitute r egions of elevated magnetic field intensity on the surface of the Sun. These structures ha ve been extensively studied in the visible range. In this regard, it has been recognized t hat the intensity contrast of faculae, relative to the photosphere, increases considerably as the line of observation moves from the center to the limb of the Sun. Such center to limb variation (CLV) suggests that the directional spectral emissivity of thedoaj:717e8f760b96417d95b413efc8b8e936 fatcat:hhezzvhikvcernygdffkzqptne