Magnetic declination of the territory of Ukraine: the results of observations and calculations
A technology is proposed for calculating the strength and angular components of the vector of the induction of the Earth's magnetic field. The technology is based on the development of a three-dimensional model of the earth's crust and the calculation of the northern (∆ В <sub>а х </sub>), eastern (∆ В <sub>а</sub><sub>y</sub> ) and vertical (∆ В <sub>а</sub><sub>z</sub> ) components of the anomalous magnetic field from it, which, together with the corresponding components ( В <sub>0 х </sub>, В <sub>0 y </sub>, В <sub>0 z </sub>) allow us to determine the total values of the В<sub>х</sub> -, В<sub>y</sub> -, В<sub>z</sub> -components of the Earth's magnetic field. With their use, the horizontal component (BH) of the geomagnetic field vector and the angles of its declination D and the inclination J are calculated. The values of the magnetic declination D in the territory of Ukraine for the epoch of 2010 are calculated (varies from -6 ° to +20 °) and the secular run for the period 2010-2015 (6.0-7.5 min/year). The contribution to the value of the magnetic declination D of its normal ( D <sub>0</sub>) and anomalous (Δ D ) components is estimated. The accuracy of the calculated values of D is estimated by comparison with the measured values of magnetic declination at magnetic observatories and points of secular run. For most points, the difference is about 3-6 minutes. Currently, the results of calculating the magnetic declination D for the time interval of 2010-2015 are used by the state services of Ukraine ("UkSATSE", "Topographic Service of the APU") to ensure flight safety and compiling topographic maps.