1. Institut für Stratosphärenforschung (ICG-I); Forschungszentrum Jülich; Jülich Germany
2. Institut für Meteorologie und Geophysik; Johann Wolfgang Goethe-Universität; Frankfurt Germany
3. Jet Propulsion Laboratory; California Institute of Technology; Pasadena California USA
4. National Oceanic and Atmospheric Administration; Climate Monitoring and Diagnostics Laboratory; Boulder Colorado USA
5. Swedish Institute of Space Physics; Kiruna Sweden
6. Center for Atmospheric Sciences; Hampton University; Hampton Virginia USA