Affiliation: | Equipe de Physique de la Terre et des Planetes (URA CNRS 1369), Bat. 504, UniversitéParis Sud, F-91405 Orsay Cedex, France;World Data Center B2, Molodezhnaya 3, Moscow, 117296, Russia;Finnish Meteorological Institute, Box-503, SF-00101 Helsinki, Finland |