Figure Captions
Figure 1 . Percent relative difference between the ATLAS-3, SOLAR-ISS (v2) and LASP WHI solar reference spectra from TSIS-1 SIM (see text). All datasets have been convolved to the TSIS-1 SIM spectral resolution prior to computing the difference as (Reference – TSIS-1 SIM) / TSIS-1 SIM x 100.
Figure 2 . (left column) The Q factors used to adjust the AFGL, QASUMEFTS, KPNO and SPTS datasets to the \(\alpha\) spectrum radiometric scale over the spectral ranges shown using the Gaussian convolution filters of the standard deviation reported in the legend. (middle and right columns) Detailed comparisons of all transition regions in the datasets comprising the TSIS-1 HSRS (see text) identified by the color of the legend.
Figure 3 . (top) The TSIS-1 Hybrid Solar Reference Spectrum (black) and two variants at lower resolution. (bottom) The relative percent difference of the HSRS from the \(\mathbf{\alpha}\) spectrum, computed identically as in Figure 1, with separate percent difference y-axis scales for the ultraviolet (UV; λ < 400 nm) and visible-to-near-infrared (VIS-NIR; λ >400 nm) portions of the spectrum. Near-identical results are obtained when computing the relative difference for the variants.
Figure 4 . A comparison of the TSIS-1 HSRS to a GOSAT TANSO-FTS solar irradiance spectrum derived from solar radiances measured in three bands during calibration scans (see text).