LOCAL SPECTRAL CHARACTHERISTICS OF ULTRA LOW FREQUENCY GEOMAGNETIC VARIATIONS WITH MODERATE GEOMAGNETIC ACTIVITY CONDITIONS AT MID LATITUDES
B. Andonov, Maria Chamati · SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 21st SGEM International Multidisciplinary Scientific GeoConference Proceedings 2021, Science and Technologies in Geology, Exploration And Mining
