OSIRIS on Odin: Initial Observational Results From the UV/visible Spectrograph

Physics

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0300 Atmospheric Composition And Structure, 0305 Aerosols And Particles (0345, 4801), 0310 Airglow And Aurora, 0394 Instruments And Techniques, 0669 Scattering And Diffraction

Scientific paper

OSIRIS, the Optical Spectrograph and Infra-Red Imager System, is a Canadian instrument on the Swedish/Canadian/Finnish/French Odin satellite launched on 20 February 2001. OSIRIS consists of (i) a UV-visible imaging spectrograph designed to measure the spectrum of sunlight scattered by the limb of the atmosphere, and (ii) a 3-channel IR imager designed to measure atmospheric airglow emissions in a limb viewing tomographic mode. The scattered sunlight spectra will be used to determine vertical profiles of minor stratospheric constituents such as ozone, NO2, OClO , BrO and aerosols and the IR images will be used to provide high resolution 3-D distributions of ozone in the mesosphere. In this paper we present an overview of the scattered sunlight radiance spectra observed under a variety of conditions for tangent heights ranging from 10 to 100 km. The limb radiance spectra are compared with predictions from radiative transfer models and the similarities and differences are discussed.

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