Modeled GOES-R/EXIS SPS signal. (left) The transmittance of the F2 G12 radiation hard glass is shown in green. Responsivity of the silicon diode and the transmittance of the NG-3 neutral density filter are shown in orange and purple, respectively. The modeled SPS is produced by applying these functions to the TSIS-1/SIM spectrum and then integrating over wavelength. (right) The blue curve is a typical full spectrum from TSIS-1/SIM, in units of spectral irradiance [Wm⁻² nm⁻¹]. The modeled SPS response is shown as the red curve. Filtered SSI, integrated over wavelength, is the modeled SPS signal (Eq. 3).