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We analyze the variability of the spectral solar irradiance during the periodfrom 7 January, 2010 until 20 January, 2010 as measured by the Herzberg channel(190-222 nm) of the Large Yield RAdiometer (LYRA) onboard PROBA2. In thisperiod of time observations by the LYRA nominal unit experienced degradationand the signal produced by the Herzberg channel frequently jumped from onelevel to another. Both these factors significantly complicates the analysis. Wepresent the algorithm which allowed us to extract the solar variability fromthe LYRA data and compare the results with SORCE/SOLSTICE measurements and withmodeling based on the Code for the Solar Irradiance (COSI).

Detection of Solar Rotational Variability in the LYRA 190 - 222 nm Spectral Band