Total Irradiance Monitor (IMAGE) NASA/Goddard Space Flight Center Caption The Total Irradiance Monitor is used to measure solar irradiance on the TCTE and SORCE missions. Credit LASP, University of Colorado Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.