Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa22a0706l&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA22A-0706
Physics
0300 Atmospheric Composition And Structure, 0305 Aerosols And Particles (0345, 4801), 0310 Airglow And Aurora, 0340 Middle Atmosphere: Composition And Chemistry, 0394 Instruments And Techniques
Scientific paper
The OSIRIS instrument onboard the Odin satellite, that was launched on February 20, 2001, from Svobodny in Russia, is a combined optical spectrograph and infrared imager that obtains atmospheric images when Odin observes the terrestrial limb. Following an initial outgas period OSIRIS was switched on with Odin in an inertially fixed pointing mode. Thus during each orbit OSIRIS looked into deep space and then rapidly scanned through the atmospheric limb before observing the atmosphere in the nadir. The first limb images showed that OSIRIS was meeting its design goal and would provide important new aeronomy data, both from the Rayleigh scattered sunlight and the airglow. These initial images showed that during the daytime the oxygen A-band is seen in emission at high tangent altitude and in absorption at low altitude. The pointing co-alignment of the Odin sub-mm/mm Radiometer and OSIRIS has been confirmed through observations of Jupiter that yielded planetary full-disk spectra. Since mid-May Odin has been operated in both a limb stare mode and a limb-scanning mode. These observations showed the expected decrease in absorption with altitude and displayed a close agreement with the pre-flight calculated spectra. It has been possible to make a preliminary analysis of the slant ozone column data using the Chappuis absorption feature. The infrared imager data have been used with the tomographic inversion procedure and show the existence of structures in the distribution of the airglow emission that have not been previously observed. This paper will present some of these initial observations and indicate the potential of OSIRIS to make some spectacular advances the study of the terrestrial atmosphere. Odin is a Swedish-led satellite project funded by Sweden (SNSB), Canada (CSA), Finland (Tekes) and France (CNES).
Degenstein Douglas Arthur
Gattinger Richard L.
Llewellyn Edam J.
Lloyd Nick D.
McDade Ian C.
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