Affiliation: | Dept. of Atmospheric Sciences, University of Washington, Seattle WA 98195, USA,; Dept. of Nuclear Physics, Lund University, S-223 62 Lund, Sweden; Dept. of Physics, University of Helsinki, SF-00170, Helsinki, Finland,; Dept. of Meteorology, Stockholm University, S-106 91 Stockholm, Sweden,; Dept. of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA;and Dept. of Meteorology, Stockholm University, S-106 91 Stockholm, Sweden |