We are grateful to Prof. K. Labitzke and B. Naujokat (Stratospheric Group, Free University of Berlin) for providing analyzed stratospheric temperatures. Many thanks to the members of the ARA group who have processed the TOVS data, and more particularly to Drs. R. Armante and J. P. Chaboureau, and to L. Crepeau, D. Kasysavanh, B. Bonnet, P. Brockmann, P. Bouster, and S. Dardaillon. CC is indebted to J. Ovarlez for valuable comments on the paper. This work was performed under CEE Contracts EV5V-CT94-0441 and ENV4-CT96-0325. The 3I processing was performed on the computers of the Institut de Développement et des Ressources en Informatique Scientifique of Centre National de la Recherche Scientifique.
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