![]() ![]() ![]() At the time of the comparison SORCE SIM has been on-orbit for 17 years while TSIS-1 observations commenced immediately after a 100-day outgassing and commissioning period. As expected, wavelength dependent differences in absolute agreement are a function of detector sensitivity and local changes in spectral slope. ![]() For this reason, a revision of the SORCE SIM absolute scale is appropriate. The TSIS-1 SIM benefitted from advanced calibration capabilities based on SI standards that were not available during the preflight calibration time period of SORCE. This comparison was conducted during the extremely quiescent Solar Cycle 24 minimum, so all observed differences and drifts between the two sensors are instrumental in nature. SORCE and TSIS-1 SIM Comparison: Absolute Irradiance Scale Reconciliation The Solar Radiation and Climate Experiment (SORCE) and Total and Spectral Irradiance Sensor (TSIS-1) conducted an intercomparison for the two Spectral Irradiance Monitors (SIM) spanning 704 days from 23 March 2018 to 25 February 2020 and permitted 554 time-matched pairs of observations. ![]()
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