Michigan Aerospace recieved a contract from Clemson University, funded by the Air Force Office of Scientific Research to design and build the SOFDI instrument. The SOFDI instrument is based on the highly successful HRDI (High Resolution Doppler Imager) instrument that is presently making measurements aboard the Upper Atmospheric Research Satellite (UARS). The SOFDI instrument will be configured as a triple Fabry-Perot etalon system, with two tunable elements, a CCD detector, and a CLIO optic. It will be initially installed in Peru, and will be used to measure a phenomenom known as “Spread-F”.