Evolution of the Sun's Spectral Irradiance Since the Maunder Minimum

Because of the dependence of the Sun's irradi- ance on solar activity, reductions from contemporary levels are expected during the seventeenth century Maunder Min- imum. New reconstructions of spectral irradiance are de- veloped since 1600 with absolute scales traceable to space- based observations. The long-term variations track the en- velope of group sunspot numbers and have amplitudes con- sistent with the range of Ca II brightness in Sun-like stars. Estimated increases since 1675 are 0.7%, 0.2% and0.07% in broadultraviolet, visible/nearinfraredandinfraredspectral bands, with a total irradiance increase of 0.2%.

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