University of Crete Island of Crete

Long term variations and solar variability of atomic oxygen and hydrogen in the mesopause region

M. Kaufmann1, M. Ern1, C. Lehmann1, L. Hoffmann1, M. Riese1, C. v. Savigny2, M. Lopez-Puertas3, A. K. Smith4, D. R. Marsh4
  1. Institut fόr Chemie und Dynamik der Geosphaere (ICG-1), Forschungszentrum Juelich, Germany
  2. Institut fόr Umweltphysik, Universitaet Bremen, Bremen, Germany
  3. Instituto de Astrofisica de Andalucia, CSIC, Granada, Spain
  4. Atmospheric Chemistry Division, NCAR, Boulder, Colorado, USA

In this talk we present global measurements of the hydroxyl mesospheric airglow as observed by the SCIAMACHY satellite instrument. SCIAMACHY is mounted on ESA's Envisat launched in March 2002 into a polar, sun-synchronous orbit with an inclination of 98.7deg and an ascending node at 22:00 local solar time. Limb observations on the night side cover about 70 degree in terms of latitude during each orbit, covering 30S-70N, depending on season. This data was utilized to retrieve atomic oxygen and hydrogen profiles by means of a new OH non-LTE model. This data is analyzed with respect to solar illumination conditions and global wave activity. A windowed space-time Fourier analysis is carried out to investigate seasonal changes in mesopause wave activity. First comparisons with simulations of the NCAR ROSE model are shown.

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