Chornogor, L. F., Holub, M. Y., & 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), 69-77. https://doi.org/10.26565/2311-0872-2020-33-06