AMPLITUDE VARIATIONS OF THE REFLECTED SIGNAL DURING VERTICAL SOUNDING OF THE IONOSPHERE AT MIDDLE LATITUDES Journal title: Solar-Terrestrial Physics Authors: Yusupov K.М., Mathews J.D., Maruyama T., Akchurin A.D., Tolstikov M.V., Sherstyukov O.N., Filip-pova... Subject(s): Physics, Atmospheric Sciences