Institution: | * Space Research Institute, Profsoyuznaya 84/32, 117810, Moscow, GSP-7, USSR ** Central Research Institute for Physics, P.O. Box 49, H-1525, Budapest, Hungary *** Service d'Aeronomie Spatiale CNRS, 13012, Marseille, France ? Space Research Institute, Berlin, GDR ? Also Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA |