%0 Journal Article %T Long-term trend of the ionospheric E-layer response to solar flares %A Givishvili, G.V. %A Leshchenko, L.N. %K ionospheric E layer, vertical sounding, solar flares, long-term trend %J Solar-Terrestrial Physics %D 2022 %N 8 %P 6 %I INFRA-M Academic Publishing LLC.