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Ukrainian Regional Magnetic Map: the results of calculations of the geomagnetic field components for the Epoch 2015 |
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Orlyuk, M. (1), Marchenko, A. (1), Romenets A. (1), Bakarjieva M. (1) |
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1Institute of Geophysics by S.I.Subbotin name NAS Ukraine, Palladin, av. 32, Kiev, 03680, Ukraine |
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A method to calculate power and angular components of the Earth’s magnetic field induction vector is proposed. This method is grounded on the development of 3D model of the Earth’s crust and following calculation by it of northern (∆Вax), eastern (∆Вay) and vertical (∆Вaz) components of anomalous magnetic field that together with corresponding components (В0x, В0y, В0z) of normal field enable to define full values of Вx -, Вy -, Вz - components of the Earth’s magnetic field. Using them the value of horizontal component (BH) as well as the angles of declination D and inclination I of geomagnetic field vector are calculated. Method allows calculate the components of the field to sources with remanent and induced magnetization. 3d magnetic model of the territory of Ukraine is represented by 230 magnetic sources. The sources of magnetic anomalies are located at depths from 1 to 10 km (sources of local magnetic anomalies) and 7-10 ÷ 30-45 km (sources of regional anomalies). The magnetization of the sources varies from 0.1 A / m to 10.0 A / m. The sources of Kursk and Krivoy Rog anomalies have a magnetization of more than 10.0 A / m. The values of the geomagnetic field components Bx, By, Bz, BH, D and J are calculated for the Epoch 2015,5. Acording to calculations the power components of the geomagnetic field have the following limits: Northern Bx = (17440 ÷ 25260) nT, Eastern By = (-2200 ÷ 7400) nT; Vertical Bz = 42700 ÷ 52700 nT, Horizontal BH = (18000÷ 25600) nT. For Ukraine in the magnetic declination D varies from -5,4 to 20.6 degrees, and magnetic inclination J - from 61,1 to 69,1 degrees According to the maps of the geomagnetic field, anomaly of power and angular components are observed in areas of intense magnetic anomalies of the regional and local ranks.
Keywords: Ukrainian Regional Magnetic Map, geomagnetic field components, magnetic model |
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