Distribution of magnetic features on the solar surface (upper row) and computed irradiance variations (lower panel). Upper plots: black areas represent umbra, blue regions denote penumbra, and red areas are faculae. Top left: 11 July 2000. Top right: 1 Dec. 2008. Lower plot: solar irradiance in Strömgren b filter. Here we normalise the total amount of spectral energy to one AU. The vertical blue lines represent the times of the two upper plots. The two horizontal lines represent the average irradiance levels in the years 2000 and 2008.
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