1. Institute of Radio Astronomy; National Academy of Sciences of Ukraine; Kharkiv Ukraine
2. V.N. Karazin Kharkiv National University; Kharkiv Ukraine
3. Main Astronomical Observatory; National Academy of Sciences of Ukraine; Kyiv Ukraine
4. Institute of Geophysics; National Academy of Sciences of Ukraine; Poltava Ukraine
5. Space Research Institute; Austrian Academy of Sciences; Graz Austria
6. LESIA & USN; Observatoire de Paris; Meudon France