Median Algorithm for Sector Spectra Calculation from Images Registered by the Spectral Airglow Temperature Imager

The Spectral Airglow Temperature Imager is an instrument, specially designed for investigation of the wave processes in the Mesosphere-Lower Thermosphere. In order to determine the kinematic parameters of a wave, the values of a physical quantity in different space points and their changes in the time should be known. As a result of the possibilities of the SATI instrument for space scanning, different parts of the images (sectors of spectrograms) correspond to the respective mesopause areas (where the radiation is generated). Algorithms for sector spectra calculation are proposed. In contrast to the original algorithms where twelve sectors with angles of 30 degrees are only determined now sectors with arbitrary orientation and angles are calculated. An algorithm is presented for sector calculation based on pixel division into sub pixels. A comparative results are shown.