Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa22a0707d&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA22A-0707
Physics
0300 Atmospheric Composition And Structure, 0310 Airglow And Aurora, 0340 Middle Atmosphere: Composition And Chemistry, 0394 Instruments And Techniques, 3260 Inverse Theory
Scientific paper
Tomography is the representation of a three dimensional object by its two dimensional cross sections and the tomographic concept uses line integral measurements of a two dimensional field to retrieve that field. The Odin satellite that was launched on February 20, 2001 is now operational and includes an Optical Spectrograph and Infra-Red Imaging System (OSIRIS). During each orbit OSIRIS makes many thousand line integral measurements of the atmospheric volume emission rate profiles at wavelengths of 1.27 μ m and 1.53 μ m. These measurements sample the atmosphere within the two dimensional satellite orbit plane and are ideal for interpretation with a tomographic technique. The developed technique uses the line of sight integrated volume emission measurements and a modified Maximum Likelihood Expectation Maximization (MLEM) algorithm to retrieve two-dimensional structure in the atmospheric volume emission profile. In this paper the utility of the developed tomographic technique is demonstrated with examples from the OSIRIS data set. In particular it is shown that the correct interpretation of the two-dimensional volume emission rate profiles can be obtained with the use of limb imaged data and the tomographic analysis. It is also shown that the simple one-dimensional analysis of single limb scans may lead to significant errors in the apparent structure of the volume emission profiles. The capability of the OSIRIS measurements for the determination of small and large-scale horizontal structures in the Oxygen Infra-Red Atmospheric and the OH Meinel band emissions are also discussed through reference to some of the first on-orbit observations with the OSIRIS Imager. Odin is a Swedish-led satellite project funded jointly by Sweden (SNSB), Canada (CSA), Finland (Tekes) and France (CNES).
Bourassa Adam E.
Degenstein Douglas Arthur
Llewellyn Edam J.
Lloyd Nick D.
McDade Ian C.
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