1. Astronomical Institute of the Slovak Academy of Sciences, SK-05960 Tatranská Lomnica, Slovak Republic
2. Main Astronomical Observatory of National Academy of Sciences, 03143 Kyiv, Ukraine
3. School of Natural Sciences, Far Eastern Federal University, 8 Sukhanova Street, Vladivostok 690950, Russia
4. Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301, USA
5. U.S. Army Research Laboratory, 2800 Powder Mill Road, Adelphi, MD 20783, USA
6. Department of Physics and Astronomy, Northern Arizona University, PO Box 6010, Flagstaff, AZ 86011, USA
7. Harvard–Smithsonian Center for Astrophysics, 60 Garden Street, MS65, Cambridge, MA 02138-1516, USA
8. Petrozavodsk State University, 33 Lenina Street, 185910 Petrozavodsk, Russia