TY JOUR TI Studying diurnal and secular variations of the Earth's magnetic field using data from Yangibazar magnetic observatory (Uzbekistan) KW geomagnetic field KW observatory KW variations KW secular variation JO Russian Journal of Earth Sciences AU Yusupov, V.R. AU Soloviev, A.A. AU Sidorov, R.. PY 2022 IS 22 PB Geophysical Center of the Russian Academy of Sciences