Winds in the upper mesosphere at mid-latitude - First results using an imaging Fabry-Perot interferometer

Physics

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Fabry-Perot Interferometers, Mesosphere, Midlatitude Atmosphere, Temperature Distribution, Wind Variations, Airglow, Auroras, Doppler Effect, Gallium Arsenides, Hydroxyl Radicals, Near Infrared Radiation, Photocathodes, Thermosphere, Upper Atmosphere, Wind Profiles

Scientific paper

The first stage of a new midlatitude facility at the Hardware Ranch Observatory for studies of the aeronomy of the middle and upper atmosphere was completed during early September 1989. An Imaging Fabry-Perot interferometer (IFPI) (Rees et al., 1982; 1990), was commissioned with a special Imaging Photon Detector equipped with a photocathode. Wind and temperature structure can be deduced from observations of the Doppler shift and Doppler broadening of airglow and auroral emissions from the mesosphere and thermosphere. The near IR Meinel bands from near 86 km in the upper mesosphere were observed with the IFPI and show 40 m/s amplitude wind oscillations, consistent with a semidiurnal tidal mode.

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