Cotutelle de thèse between Potsdam University and St. Petersburg State University
Cooperation with Prof. Mikhail Pudovkin † and Irina Mironova, St. Petersburg State University, St. Petersburg (Russia)
Topic: Influence of solar activity on atmospheric transparency and aerosol optical properties
Duration: October 2003 - July 2006
Disputation: 14th December 2005 and 20th June 2006