Institution: | (1) Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, 8042 Graz, Austria;(2) Royal Observatory of Belgium, Av. Circulaire, 3, 1180 Brussels, Belgium;(3) Space Research Institute (IKI), 117997, 84/32 Profsoyuznaya Str, Moscow, Russian Federation;(4) Swedish Institute of Space Physics (IRF), Box 812, 98128 Kiruna, Sweden |