00713naa#a2200205#i#450# EN\INFRA-M\bibl\18353 20240516134329.4 2712-9640 20180329b2018####ek#y0engy0150####ca RUS RU Electron density at F1-layer heights in the last solar minimum (2007–2009) Journal article Moscow INFRA-M Academic Publishing LLC. 2018 3 с. Journal article local Геология. Геологические и геофизические науки. 55 RUS Kushnarenko Galina Petrovna Yakovleva Olga Evgenyevna Kuznetsova Galina Mihaylovna naukaru.ru