00740naa#a2200205#i#450# EN\\bibl\18352 20260310083545.2 2712-9640 20171227b2017####ek#y0engy0150####ca RUS RU North-south asymmetry of ultra-low-frequency oscillations of Earth’s electromagnetic field Journal article Irkutsk Institute of Solar-Terrestrial Physics SB RAS 2017 6 с. Journal article local Геология. Геологические и геофизические науки. 55 RUS Guglielmi Anatol Vladimirovich Klain Boris Icikovich Potapov Alexander Sergeevich ras.editorum.ru