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).