GOES-16/SOLSTICE (black), GOES-17/SOLSTICE (red), GOES-18/SOLSTICE (blue), and GOES-19/SOLSTICE (orange) sampled at 0.1 nm per spectral bin. Also shown are linear fits to the ratios and a dashed line for Ratio = 1. The ~10% and 25% larger MgII h and k emissions observed for GOES-18 and GOES-19 are consistent with the uncertainty in extrapolating MgII emissions in the SOLSTICE spectra from July 4, 2019 and September 18, 2019 to 2022 and 2024 (Woods et al., 2018).