%0 Journal Article %T Geomagnetic disturbances at F1-layer heights under different solar activity conditions over Norilsk %A Kushnarenko, G.P. %A Yakovleva, O.E. %A Kuznetsova, G.M. %K geomagnetic disturbances, electron density, spring-fall asymmetry %J Solar-Terrestrial Physics %D 2019 %N 5 %P 2 %I INFRA-M Academic Publishing LLC.