%0 Journal Article %A V. V. Bogdanov %A A. V. Pavlov %T Disturbances in the F2 layer of the ionosphere preceding the onset of earthquakes with $ M\geq 6.0$ in the Kamchatka region %J Vestnik KRAUNC. Fiziko-matematičeskie nauki %D 2023 %P 67-80 %V 45 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/VKAM_2023_45_4_a4/ %G ru %F VKAM_2023_45_4_a4