Comparison of the solar rotational relative spectral variability between TSIS-1 SIM observations (grey) with the NRLSSI2 model (pink) and SATIRE-S model (blue) for active region contrast in August 2022 when multiple active regions were present during a solar 27-day rotational period. Here maximum activity condition is the average SSI for the August 9–12, 2022 time frame, and the minimum activity condition is represented by the average SSI for August 23–26, 2022 (see Fig. 13).