[1] Commissariat Energie & Cercle Astrophys Fleurance, Paris, France
[2] Kharkov Natl Univ, Kharkiv, Ukraine
[3] Kharkov Inst Phys & Technol, Natl Sci Ctr, Kharkiv, Ukraine
[4] NAS Ukraine, Inst Appl Phys, Sumy, Ukraine
[5] NAS Ukraine, Bogolyubov Inst Theoret Phys, Kiev, Ukraine
[6] Nat Acad Sci Ukraine, Space Res Inst, Kiev, Ukraine
[7] State Space Agcy Ukraine, Kiev, Ukraine
[8] Ist Sistemi Complessi, CNR, Turin, Italy
[9] Politecn Torino, Dipartimento Energia, Turin, Italy