Study of the Multifractality of Geomagnetic Variations at the Belsk Observatory

Study of the dynamics of periodic variations with the periods from 1 to 27 days using the wavelet transform and scaling analysis by the method of modulus maxima of the wavelet transform coefficients is carried out using the results of instrumental observations of the geomagnetic field performed at the Belsk Central Geophysical Observatory in 2008 and 2018 (low solar activity) and in 2014 (high solar activity). A change in the intensity of periodic variations is established. The close to monofractal nature of diurnal geomagnetic variations is shown. The 27-day variation and its harmonics have a higher degree of multifractality during the solar maximum compared to the solar minimum.