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The geomagnetic field varies in time and space, being a signal composed of periodic and non-periodic elements and is monitored in a tri-axial system within the geomagnetic observatories of the INTERMAGNET network across the planet. In the work, based on these data, we use for spectral evaluation (Fourier, wavelet, signal decompositions in approximations and details with various functions on different levels, etc.) in order to analyze different geomagnetic phenomena (such as: geomagnetic storms, disturbances, etc.)...