Fabry-Perot interferometer

The Fabry-Perot interferometer (FPI) system was installed in May 2015 in collaboration with Clemson University of USA. It is used to measure the nightglow orginated from the altitude range between 200 and 300 km above the Earth's surface. From this observation the neutral wind speed and neutral temperature will be inferred from Doppler shift and Doppler brodening respectively.