Affiliation: | 1. Space Research Institute, U.S.S.R. Academy of Sciences, Profsoyuznaya 84/32, 117810, Moscow, U.S.S.R.;2. Center for Space Research of Polish Academy of Sciences, Ordona 21, PL-01237, Warsaw, Poland;3. Central Institute for Astrophysics, G.D.R. Academy of Sciences, Telegrafenberg 15, Potsdam, G.D.R.;1. Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, Prague 18000, Czech Republic;2. LPC2E/CNRS Orléans, 3A Avenue de la Recherche Scientifique, Orléans 45071, France |