Top panel: TSI calculated with SATIRE-S using SDO/HMI filling factors covering period of solar cycle 24 in combination with NESSY and ATLAS9 spectra (red and black curves, respectively; almost indistinguishable). TSI 1σ uncertainty range as given by the empirically corrected SATIRE-S based on ATLAS9 spectra is shown in grey. The dashed lines designate the periods of minimum (from 3 June 2010 to 2 April 2011) and maximum (from 4 December 2014 to 3 October 2015) solar activity over which the average values of SSI were calculated for computation of SSI variability profile (Eq. (3)) shown in the bottom panel. Bottom panel: relative difference between SSI at activity maximum and minimum versus wavelength (variability profile, Eq. (3)). SSI at minimum and maximum solar activity are averages over the periods marked “min” and “max” (and dashed lines) in the upper panel. The dot represents a negative value. The resolution of all curves is that of the ATLAS9 spectrum (see Sect. 2). Shortward of about 150 nm the black curve is truncated because of ATLAS9 limitations.
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