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MIPAS Pointing assessment

Michael Kiefer(1)

(1) IMK Karlsruhe, Forschungszentrum Karlsruhe, 76344 Eggenstein-Leopoldshafen, Germany

Abstract

Authors: M. Kiefer, T. von Clarmann, B. Funke*, N. Glatthor, U. Grabowski, M. Hoepfner, S. Kellmann, A. Linden, M. Lopez-Puertas*, M. Milz, T. Steck, G.P. Stiller, D.-Y. Wang, and H. Fischer

Affil.: Forschungszentrum Karlsruhe, Institut fuer Meteorologie und Klimaforschung (IMK), Karlsruhe, Germany *Instituto de Astrofisica de Andalucia, CSIC, Granada, Spain

Abstract Text: The scientific L2 retrieval processor for MIPAS operated at IMK allows to retrieve pointing information, in terms of tangent altitudes, along with temperature. The retrieved tangent altitudes are independent of engineering line-of-sight information. The difference of pointing retrieved from the reprocessed high resolution MIPAS spectra and the engineering pointing information was examined wrt spatial/temporal behaviour. Among others the following characteristics of MIPAS pointing could be identified: Prior to December of 2003 there is a drift of about 50-100 m/h, which is due to a slow change in the satellite attitude. A correction of this attitude is done twice a day, which leads to discontinuities in the order of up to 2 km in the pointing. Further there is a systematic difference of mispointing between the poles which amounts to 1.5-2 km, i.e. there is a conspicuous orbit-periodic feature. The analysis of the correlation between the instrument's viewing angle azimuth and differential mispointing supports the hypotheses that part of this latter phenomenon can be attributed to an uncorrected roll angle of the satellite/instrument system of approx. 30-50 mdeg.

 

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry