Sun: reconstructions of long-term solar irradiance
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The trend shown in the longer reconstruction was inferred by Lean (2000) from modeling the changes in the brightness of stars similar to the Sun. The trend depicted in the shorter reconstruction by Y. Wang et al. (2005) was based on a magnetic flux model that simulated the long-term evolution of faculae (bright granular structures on the Sun’s surface). Both models track a slight increase in solar irradiance since 1900.
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