1. Al-Farabi Kazakh National University, Al-Farabi Ave., 71, 050040 Almaty, Kazakhstan
2. Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 877, Ensenada, 22800 Baja California, México
3. Space Physics and Astronomy research unit, University of Oulu, PO Box 3000, FIN-90014 Oulu, Finland
4. Astronomical Institute, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, CZ-180 00 Praha 8, Czech Republic
5. Instituto de Física y Astronomía, Universidad de Valparaíso, Av. Gran Bretaña, 1111 Valparaíso, Chile
6. Astronomical Institute, Academy of Sciences, Fričova 298, CZ-251 65, Czech Republic
7. Research Centre for Theoretical Physics and Astrophysics, Institute of Physics, Silesian University in Opava, Bezručovo nám. 13, CZ-746 01 Opava, Czech Republic