1. Environmental Optics Laboratory, Department of Biological Physics, ELTE Eötvös Loránd University, H-1117 Budapest, Pázmány sétány 1, Hungary
2. Department of Astronomy, ELTE Eötvös Loránd University, H-1117 Budapest, Pázmány sétány 1, Hungary
3. Meteorological Institute, Universität Hamburg, Bundesstrasse 55, D-20146 Hamburg, Germany
4. Max Plack Institute für Physik Komplexer Systeme, Nöthnitzer Strasse 38, D-01187 Dresden, Germany
5. University of Public Service, Faculty of Water Science, Ludovika tér 2, H-1083 Budapest, Hungary