Abstract
The Solar Radiation and Climate Experiment (SORCE) is a NASA-sponsored Low-Earth-Orbit satellite mission providing measurements of incoming x-ray, ultraviolet, visible, near-infrared and total solar radiation. SORCE is currently in its 10th year of operation. The Spectral Irradiance Monitor (SIM) instrument has been providing daily solar spectrum covering the wavelength range from 240 to 2400 nm at a resolution between 0.60-33 nm using a single optical element. SIM was designed to provide an absolute accuracy of < 2% over the wavelength coverage and a goal of longterm accuracy of 0.03% per year. The exposure of the optics, detectors and electronics to the harsh space environment causes changes in their properties. With the very high accuracy goals, it is critical to keep track of these changes as precisely as possible throughout the lifetime of the mission. We will be reviewing the methods used to track and correct for SIM instrumental degradation of the optics and the detectors since the start of the mission. We will also discuss lessons learned in the design of long lived solar observing missions and how they were applied to the SIM instrument on the coming Total Solar Irradiance Sensors (TSIS) mission.
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