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LOCAL SPECTRAL CHARACTHERISTICS OF ULTRA LOW FREQUENCY GEOMAGNETIC VARIATIONS WITH MODERATE GEOMAGNETIC ACTIVITY CONDITIONS AT MID LATITUDES
Abstract
The study of the dynamic behavior of the Earth’s magnetic field and its interaction with the Solar wind is an important for better understanding of the processes in the magnetosphere and on the surface of the Earth’s ground. This dynamic system is created due to solar-terrestrial interactions. The effects on the variations of the magnetic field induced by geomagnetic storms are strongly dependent on the local time and the latitude. Our goal is to study of the spectral characteristics of the ULF geomagnetic field variations with moderate geomagnetic activity conditions. The data sets for the ULF geomagnetic field variations, recorded at Geomagnetic Observatory Panagjuriste, Bulgaria, for the Bz component of the IMF (Interplanetary Magnetic Field) and for the Kp index value are analyzed. Applying Morlet wavelet analysis over time intervals with duration of four hours, the dynamic spectra of the geomagnetic field variations were obtained for three days: 16 July 2017, 31 August 2017 and 20 April 2018. Original results of the geomagnetic field variations over different time scales are obtained. These are disturbed by moderate geomagnetic activity over all time scales. The disturbances are compared by the time of their occurrence and periods of manifestation. It is found that all disturbances behave in a similar way along the three days. The geomagnetic variations over time scales 150-700 seconds (in Pc5 range) are strongly affected by the geomagnetic storms. They are related with energy transfer from the solar wind to the magnetosphere and many factors connected with magnetosphere-ionosphere system interactions. For time scales smaller than 150 seconds (in Pc2-Pc4 range) these type of disturbances in the ULF geomagnetic field variations behave differently on 31 August 2017 for the time intervals 00-03UT, 12-15UT and 20-23UT, where in contrast to the same intervals of the other days, they appear predominantly with time scales smaller than 150 seconds: 10-45 seconds, 45-150 seconds and 25-75 seconds.
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