00769naa#a2200229#i#450# EN\\bibl\13890 20260312173642.4 2712-9640 20170629b2017####ek#y0engy0150####ca RUS RU Sporadic potassium layers and their connection to sporadic E layers in the mesopause region at Beijing, China Journal article Irkutsk Institute of Solar-Terrestrial Physics SB RAS 2017 5 с. Journal article local Геология. Геологические и геофизические науки. 55 RUS Jing Jiao Guotao Yang Jihong Wang Xuewu Cheng Faqun Li ras.editorum.ru