Adaption of an algorithm based on the two-dimensional Fast-Fourier-Transform (FFT) for the Analysis of OH-airglow intensity measurements

Kurzfassung

Recent observational and theoretical studies of the properties of small-scaled gravity waves have highlighted the global effects on the circulation from the surface to the middle atmosphere. Airglow imaging allows to study small-scaled gravity waves in the mesopause (ca. ~87 km height). A new camera system is installed at DLR Oberpfaffenhofen with a narrow field of view and with the ability to take an image every 0.5 seconds which is quite new in the field of airglow imaging systems. The study is based on observations of 2014 year. In this thesis an algorithm to analyze small-scaled gravity wave structures from the provided images of the airglow emission is described and adapted. The algorithm involves the two-dimensional Fourier analysis and can handle a large amount of data. It determines the horizontal wavelength and direction of propagation. The results are grouped monthly and compared to literature.