Authors: Greg Kopp, George Lawrence, Gary Rottman
The SORCE Total Irradiance Monitor (TIM) has been acquiring total solar irradiance (TSI) measurements since early March of 2003. As with any instrument observing the un-occulted Sun for extended periods of time, on-orbit degradation must be estimated to provide corrections for data processing. I will provide details of the post-launch TIM calibration tracking methods, including radiometer degradation measurements, cavity reflectance monitoring, power linearity correction, dark signal extrapolation, and servo gain calibrations.