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The LYRA instrument onboard ESA PROBA2 satellite will provide 6-hourly solarirradiance at the Lyman-alpha (121.6 nm) and the Herzberg continuum (~200–220 nm wavelength range). Because the nowcasting of the neutral andionic state of the middle atmosphere requires the solar irradiance for thewide spectral range (120–680 nm) we have developed the statistical tool forthe reconstruction of the full spectrum from the LYRA measurements. Theaccuracy of the reconstructed irradiance has been evaluated with 1-Dtransient radiative-convective model with neutral and ion chemistry usingthe daily solar spectral irradiance measured with SUSIM and SOLSTICEinstruments onboard UARS satellite. We compared the results of transient1-year long model simulations for 2000 driven by the observed andreconstructed solar irradiance and showed that the reconstruction of thefull spectrum using linear regression equation based on the solar irradiancein two LYRA channels can be successfully used for nowcasting of the middleatmosphere. We have also identified conditions when the proposed approachdoes not yield spectral reconstruction with sufficient accuracy

Reconstruction of the solar spectral UV irradiance for nowcasting of the middle atmosphere state on the basis of LYRA measurements