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- W2004663456 abstract "A new instrument for the measurement of integrated rotational temperature and emission rate of the O2 Atmospheric (0–1) nightglow layer at 95 km and for the characterization of internal atmospheric gravity waves passing through this layer has been built and successfully tested. It bears the acronym MORTI for mesopause oxygen rotational temperature imager. MORTI is a spatial spectral scanning Fabry-Perot spectrometer in which the etalon is a narrow band interference filter and the detector is a CCD camera. This design makes for a compact, stable, high-resolution, ground-based instrument of large throughput, currently capable of measuring emission rate fluctuations of ± 2% and integrated temperature fluctuations of ± 2 K. Appending a conical mirror at the top provides an annular field of view 108 km across at 95 km altitude, and imposing a field stop at the vertex of this cone ensures the orthogonal separation of the image into a radial, spectral dimension and an azimuthal, spatial dimension. This separation makes possible the horizontal tracking of perturbations of the layer in both temperature and emission rate as functions of time, from which the horizontal wave velocity and the wave period may be found. As an example, the temperature and emission rate fluctuations of the O2 Atmospheric (0–1) band over Puerto Rico on April 5/6, 1989, measured during the AIDA '89 campaign, are shown to imply a wave of 126 min period and 712 km horizontal wavelength." @default.
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- W2004663456 date "1991-10-01" @default.
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- W2004663456 title "MORTI: A mesopause oxygen rotational temperature imager" @default.
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- W2004663456 doi "https://doi.org/10.1016/0032-0633(91)90017-5" @default.
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