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The Spectral Airglow Temperature Imager is a ground-based spectral instrumentfor spatial registration of airglow emissions. The basic aim of the instrumentdevelopment is the investigation of gravity waves based on the spatialcharacteristics of the temperature field at the altitude of mesopause and itsevolution in the time. The temperature retrieval is based on matching measuredand preliminary calculated synthetic spectra. Possibilities are presented forgeneralization of the basic regression equation which connects the measured andthe synthetic spectra. A linear change of the background for the entire filtertransmittance interval was presumed. Numerical experiments by Monte-Karlosimulation were conducted. The presented results show a bigger stability of theproposed approach in comparison with the traditional one, without consideringthe linear background.

Mesopause Temperature Retrieval from SATI Measured Spectra with a Linear Background Component. Results from the Numerical Simulation