OBSERVATIONS OF THERMOSPHERIC WIND VELOCITIES AND TEMPERATURES BY THEUSE OF A FABRY-PEROT DOPPLER IMAGING-SYSTEM AT SYOWA-STATION, ANTARCTICA

A new optical instrument, the Fabry-Perot Doppler imaging system (FPDI S), has been developed for observations of two-dimensional distributio ns of thermospheric wind velocities and temperatures by the measuremen t of the Doppler shift and width of the aurora or of the airglow emiss ion lines of atomic oxygen OI 557.7 nm and OI 630.0 nm over a wide fie ld of view (165 degrees). A technique for the derivation of Doppler te mperatures and wind velocities was developed by use of a truncated Fou rier series. Thermospheric wind velocities and temperatures have been obtained with unprecedented high temporal (1 min) and spatial (24 poin ts for an all-sky image) resolutions. Errors in the derived wind veloc ities and temperatures are estimated to be less than 25 m/s and 100 K, respectively, for inner-fringe positions and 35 m/s and 170 K for out er-fringe positions, respectively. This system was applied to observat ions of thermospheric wind velocities and temperatures at Syowa Statio n (69.00 degrees S, 39.58 degrees E), Antarctica for the period of one austral winter in 1990. (C) 1995 Optical Society of America