Chornogor, L. F., Holub, M. Y. and Luo, Y. (2020) “Statistical characteristics of geomagnetic storm activity during solar cycle 24, 2009–2020”, Visnyk of V.N. Karazin Kharkiv National University, series “Radio Physics and Electronics”, (33), pp. 69-77. doi: 10.26565/2311-0872-2020-33-06.