Computed Filling-in of Fraunhofer Lines 3850–4450 Å

The measured filling-in of Fraunhofer lines in the sky spectrum 3850–4450 Å is compared with synthetic filling-in computed for three different incoherent scattering processes, i.e. rotational Raman scattering by O2 and N2, Rayleigh wing scattering from the Earth's surface, and atmospheric aerosol fluorescence. It is concluded that rotational Raman scattering is the most likely contributor to the observed filling-in.