Fabry-Perot Interferometer FPI
The Fabry-Perot Interferometer (FPI) is a redline emission (630 nm) instrument for thermospheric wind observations. The FPI is installed at the Space Environment Research Laboratory (SERL) of the Centre for Atmospheric Research (CAR), National Space Research and Development Agency (NASRDA), Abuja, Nigeria (8.99oN, 7.38oE), through collaboration with the National Center for Atmospheric Research (NCAR), USA. The instrument measures the Doppler shift in the O 630 nm airglow emission induced by the neutral wind. PI of the instrument is Dr Qian Wu of NCAR.
The instrument has a rotating stage (with a mirror for viewing at 45 degree elevation angle). The rotating stage directs the instrument to view at angles 45o, 135o, -45o, and -135o in azimuth.
Data from the instrument is stored in image format. Each image is stored in one file, with a 1384 (2-byte integer) header. The image size is 346×258 (2-byte unsigned integer).
The FPI observations are night-time observations. The images are recorded at typical intervals of about 15 seconds.
The data is available from November 2015
For more information contact:
Dr. Daniel Okoh