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The paper presents the results of a comparative analysis of time series of Wolf numbers, total squares of spots groups, daily characteristics of the solar large-scale magnetic field (LSMF), its two components — photospheric and polar magnetic fields – with time series of the geomagnetic planetary index Ap. The cyclic changes of solar and magnetic activity and the asymmetry of magnetic field polarity reversal in two solar hemispheres were observed. The focus of this study was to determine the level of dependence of the geomagnetic activity on the dynamics of magnetic activity during the periods of the solar magnetic field polarity reversal. We used the complete homogeneous data series of magnetographic LSMF measurements (http://wso.stanford.edu), the synoptic maps of photosphere magnetic fields polarities (http://solis.nso.edu), the averaged daily squares of spots groups (http://solarscience.msfc.nasa.gov/greenwch.shtml), and the average daily values of Ap (ftp.swpc.noaa.gov/pub/warehouse). The pair of 22-23 cycles and the running 24 cycle of solar activity were investigated. We used a cumulative method of graphical representation of the studied observational data. The results are: • The north-south asymmetry of spots formation was found during 22–24 cycles. It has been established that the maxima of activity in different hemispheres are shifted by more than 1.5 years. This may be indicative of the independence of the solar cycles’ development in these hemispheres. • In the leading spots, the polarities change signs at the beginning of each cycle. At the solar poles, the magnetic field polarity reversal takes place during periods of solar activity maximum and not always at the same time. It is supposed that such an evolution of the solar magnetic field leads to the appearance of coronal holes and geomagnetic activity. • The evolution of the distribution of both solar and geomagnetic activity in the last three cycles (1986–2019) was investigated in detail. The geomagnetic disturbances are not maximal during the period of maximal spots formation, but 1–2 years later. The geomagnetic activity reflects the north-south asymmetry of the solar cycle and also the process of the solar magnetic field polarity reversal assotiated with it. [ABSTRACT FROM AUTHOR]

In the paper, we show the necessity of normalization of the static geomagnetic field (GMF) inside high-rise frame-monolithic houses to safe values (90% of the natural rate at least). Massive ferromagnetic construction of these buildings significantly (up to 50 %) weakens the natural GMF. The normalization methods are based on mathematical modeling of GMF in a residential area. Simplified physical models of reinforced concrete building structures are developed and used. The results of experimental studies are also used in the framework of the development of the methods. The following methods of normalization of GMF are presented and justified: 1) the use of special steel with a relative permeability less than 70 in housing construction; 2) restrictions on the use of long steel elements with the elongation coefficient in the critical range of 4

The paper studies the conformities of admixtures' ions motion in a water environment under the influence of the longitudinal magnetic field. We determine the necessary induction of the magnetic field to create the "magnetic trap" for the admixtures' ions in a pressure pipeline. Moreover, we provide some recommendations on designing the magnetic catcher of the admixtures' ions in a water environment. [ABSTRACT FROM AUTHOR]

Purpose. Development of methodology and experimental studies of the layout of the active screening of technogenic power frequency magnetic fields with different control algorithms with a single coil magnetic executive body. Methodology. In the course of mathematical modeling to determine geometrical size of the magnetic coil executive body based on the size of the protected area, and the configuration of the coil magnetic executive body is determined based on the required uniformity of the magnetic field distribution in the protected area. Results. Experimental studies of open, closed and combined systems of active screening of technogenic power frequency magnetic fields with a single coil magnetic executive body. Originality. For the first time experimentally confirmed the possibility of reducing the level of induction of man-made power frequency magnetic fields in a given area 3-5 times with a single coil magnetic executive body.. The possibility of reducing the level of the magnetic field in a limited area of the space by 15-20 times Practical value. On the basis of the calculations the layout of active screening of technogenic power frequency magnetic fields with different control algorithms with a single coil magnetic executive body has been made. [ABSTRACT FROM AUTHOR]