1. Saint-Petersburg State University; St. Petersburg Russia
2. Finnish Meteorological Institute; Helsinki Finland
3. NASA Goddard Space Flight Center; Greenbelt Maryland USA
4. Atmospheric, Oceanic and Space Sciences; University of Michigan; Ann Arbor Michigan USA
5. Department of Physics and Astronomy; Dartmouth College; Hanover New Hampshire USA
6. High Altitude Observatory; National Center for Atmospheric Research; Boulder Colorado USA