TY JOUR TI Electron density in the F1 layer over Norilsk in 2007–2014 KW annual variations KW electron density KW semi-empirical model JO Solar-Terrestrial Physics AU Kushnarenko, G.P. AU Yakovleva, O.E. AU Kuznetsova, G.M. PY 2019 IS 5 PB INFRA-M Academic Publishing LLC.