00725naa#a2200205#i#450# EN\\bibl\18353 20260312110329.4 2712-9640 20180329b2018####ek#y0engy0150####ca RUS RU Electron density at F1-layer heights in the last solar minimum (2007–2009) Journal article Irkutsk Institute of Solar-Terrestrial Physics SB RAS 2018 3 с. Journal article local Геология. Геологические и геофизические науки. 55 RUS Kushnarenko Galina Petrovna Yakovleva Olga Evgenyevna Kuznetsova Galina Mihaylovna ras.editorum.ru