SORCE/TSIS Overlap Analysis: Absolute Scale Comparison and Stability Estimate

Contemporaneous observations of the Solar Spectral Irradiance (SSI) from the Solar Radiation and Climate Experiment (SORCE) SIM (Solar Irradiance Monitor) and the Total and Spectral Irradiance Sensor (TSIS) SIM have provided almost 2 years of overlap that allowed an absolute scale correction for the SORCE SIM instrument which was launched with an absolute irradiance scale less accurate than TSIS by almost a factor of 10. The overlap between SORCE and TSIS was also an adequate length of time for the quantification of wavelength dependent long-term stability of these instruments. A similar analysis was performed between TSIS-SIM and the SORCE-SOLSTICE instruments (Solar Stellar Irradiance Comparison Experiment) for the common wavelength range of 200-310nm. We present the results from these analyses with a description of the new publicly available SORCE SIM data products.