Calibration of the Halogen Occultation Experiment Sun Sensor

The calibration of the Halogen Occultation Experiment (HALOE) Sun sensor is described. This system consists of two energy balancing silicon detectors which provide coarse azimuth and elevation control signals, and a silicon photodiode array which provides top and bottom solar edge data for fine elevation control. All three detectors were calibrated on a mountaintop in Tucson, Arizona, using the Langley plot technique. The conventional Langley plot technique was modified to allow calibration of the two coarse detectors which operate wideband. A brief description of the test setup is also given. The HALOE instrument is a gas correlation radiometer that is now being developed for the Upper Atmospheric Research Satellite (UARS).