%0 Journal Article %T Variability of ionospheric ionization over Eurasia according to data from a high-latitude ionosonde chain during extreme magnetic storms in 2015 %A Chernigovskaya, M.A. %A Setov, A.G. %A Ratovsky, K.G. %A Kalishin, A.S. %A Stepanov, A.E. %K high-latitude ionosphere; ionosonde chain, geomagnetic storm, variations of ionospheric ionization %J Solnechno-Zemnaya Fizika %D 2024 %N 10 %P 14 %I INFRA-M Academic Publishing LLC.