TY JOUR TI A technique for detection of ULF Pc3 waves and their statistical analysis KW geomagnetic pulsations KW ionosphere KW magnetosphere KW automatic signal detection JO Russian Journal of Earth Sciences AU Bogoutdinov, S.R. AU Yagova, N.V. AU Pilipenko, V.A. AU Agayan, S.M. PY 2018 IS 18 PB Geophysical Center of the Russian Academy of Sciences