Affiliation: | 1. Division of Plasma Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, SK ‐ 84248 Bratislava, Slovakia;2. Department of Astronomy, Earth Sciences, and Meteorology, Faculty of Mathematics, Physics and Informatics, Comenius University, SK ‐ 84248 Bratislava, Slovakia;3. Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, SK ‐ 84248 Bratislava, Slovakia |