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Modeling the variability of the solar spectral irradiance is a key factor forunderstanding the solar influence on the climate of the Earth. As a first stepto calculating the solar spectral irradiance variations we reproduce the solarspectrum for the quiet Sun over a broad wavelength range with an emphasis onthe UV. We introduce the radiative transfer code COSI which calculates solarsynthetic spectra under conditions of non-local thermodynamic equilibrium(NLTE). A self-consistent simultaneous solution of the radiative transfer andthe statistical equation for the level populations guarantees that the correctphysics is considered for wavelength regions where the assumption of localthermodynamic equilibrium (LTE) breaks down. The new concept of iteratedopacity distribution functions (NLTE-ODFs), through which all line opacitiesare included in the NLTE radiative transfer calculation, is presented. We showthat it is essential to include the line opacities in the radiative transfer toreproduce the solar spectrum in the UV. Through the implemented scheme ofNLTE-ODFs the COSI code is successful in reproducing the spectral energydistribution of the quiet Sun.

NLTE model calculations for the solar atmosphere with an iterative treatment of opacity distribution functions