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SOL-ACES
SOLar Auto-Calibrating Extreme UV/EUV Spectrometer
SOL-ACES Is an extreme UV monitor provided by the Fraunhofer-Institut für Physikalische Messtechnik in Freiburg in Germany.
Solar radiation measurements with unequalled precision within the spectral range from 17 nm to 220 nm are scheduled using the SolACES experiment of the SOLAR. This instrument has been characterised in the PTB radiometry laboratory at BESSY.
SOL-ACES has four grazing incidence planar grating spectrometers plus two three-signal ionization chambers with exchangeable band pass filters to determine the absolute fluxes from 220-16 nm repeatedly during the mission.
For the TSI (Total Solar Irradiance) the absolute accuracy to be achieved is of the order of 0.1 % and for the SSI (Solar Spectral irradiance) from 1 % in the VIS, 2 % in the UV, 5 % in the FUV to 10 % in the XUV spectral regions.