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We analyze the light curves of the recent solar eclipses measured by theHerzberg channel (200-220 nm) of the Large Yield RAdiometer (LYRA) onboardPROBA-2. The measurements allow us to accurately retrieve the center- to-limbvariations (CLV) of the solar brightness. The formation height of the radiationdepends on the observing angle so the examination of the CLV provideinformation about a broad range of heights in the solar atmosphere. We employthe 1D NLTE radiative transfer COde for Solar Irradiance (COSI) to model themeasured light curves and corresponding CLV dependencies. The modeling is usedto test and constrain the existing 1D models of the solar atmosphere, e.g. thetemperature structure of the photosphere and the treatment of the pseudo-continuum opacities in the Herzberg continuum range. We show that COSI canaccurately reproduce not only the irradiance from the entire solar disk, butalso the measured CLV. It hence can be used as a reliable tool for modeling thevariability of the spectral solar irradiance.

Eclipses observed by LYRA - a sensitive tool to test the models for the solar irradiance