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Gravity waves play a major role in mesospheric and lower thermospheric (MLT) dynamics and global observations of gravity waves in this region are of particular interest. To this end, a limb sounding spatial heterodyne interferometer (SHI) is used to retrieve temperature profiles which can be subsequently used to determine wave parameters. It resolves rotational structures of the O2 atmospheric A-band airglow emission in the near-infrared. It is visible during day- and night-time, allowing a continuous observation. The image is taken by a 2D detector plane of 900 × 900 pixels. The horizontal axis is a superposition of spectral and spatial information; the vertical axis corresponds to different tangent altitudes. We propose to split the interferogram into two halves and perform a retrieval on both sides separately, thus obtaining two spatial tracks of independent temperature data. This can be utilized to obtain some information on 3D propagation characteristics of gravity waves. The feasibility and subsequent concerns of the practical usage of the interferogram split will be discussed.
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Konstantin Ntokas, Martin Kaufmann, Jörn Ungermann, Peter Preusse, Martin Riese, "Retrieval of gravity wave parameters using half interferograms measured by CubeSats," Proc. SPIE 12236, CubeSats and SmallSats for Remote Sensing VI, 1223609 (30 September 2022); https://doi.org/10.1117/12.2633460