TY JOUR TI Effects of 7September 5–12, 2017 solar flares on regional disturbance of Earth’s ionosphere as recorded by GNSS stations located in the Volga Federal District of the Russian Federation KW ionosphere KW GNSS KW total electron content KW solar flare KW magnetic storms KW GPS KW GLONASS KW TEC maps JO Solar-Terrestrial Physics AU Maksimov, D.S. AU Kogogin, D.A. AU Nasyrov, I.A. AU Zagretdinov, R.V. PY 2023 IS 9 PB INFRA-M Academic Publishing LLC.