Details of the SORCE/TIM On-Orbit Calibrations


Authors:  Greg Kopp, George Lawrence, Gary Rottman

Affiliation:  University of Colorado, LASP


            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.