Constants and calculated parameters Units Used formulas, their numbers Calculation results μ0 H/m 1.26 × 10−6 Distance between the middle point of the lower mantle layer and the bottom surface, Rнм m 6.37 × 106 Radius of the lower mantle outer surface, RD m 5.68 × 106 Lower mantle layer thickness, ΔRD m 1.9 × 106 Spherical surface SD area with radius RD m2 ${S}_{D}=4\text{π}{R}_{D}^{2}$ 4.05 × 1014 Thermofield ЕT density in the lower mantle D at ΔT = 4000˚C V/m ${Е}_{T}=\beta \cdot \Delta T/\Delta {R}_{D}$ , (3) where β = 0.0003 V/deg. 1.58 × 10−7 Plank’s constant, ħ J・s 1.05 × 10−34 Electron concentration in a unit volume of the lower mantle ores, n m−3 1.0 × 1020 Electron charge, е C 1.6 × 10−19 Electron mass, mе kg 9.1 × 10−31 Lower mantle electroconductivity, σ S/m 0.4 Fermi momentum, pF m・kg/s ${p}_{F}=\hslash {\left(3{\text{π}}^{2}n\right)}^{1/2}$ (10) 1,51 × 10−27 Electron mean free path, l nm $l=\frac{\sigma \hslash {\left(3{\text{π}}^{2}\right)}^{1/3}}{{e}^{2}{n}^{2/3}}{10}^{9}$ (7) 0.237 Current density, j A/m2 $j={e}^{2}n{E}_{T}\frac{l}{{p}_{F}}$ (9) 6.34 × 10−8 Total amount of current of lower mantle D coming through the SD surface, Itop А ${I}_{top}=j{S}_{D}$ (11) 2.57 × 107 Magnetic induction on the Earth’s bottom surface ${B}_{ТТ}^{top}$ (according to the measurements, В0 is 3.4 × 10−5 T on the equator) T ${B}_{ТТ}^{top}=\frac{3{\mu }_{0}{I}_{top}\text{Δ}{R}_{D}}{4\text{π}{R}_{нм}^{2}}\text{sin}\alpha$ (14) 4.62 × 10−6 The heat, emitted in the lower mantle by the thermocurrents Itop in a year, ${Q}_{lm}$ J・year ${Q}_{lm}=\frac{1}{\sigma }{J}^{2}{V}_{lm}\Delta t$ (15) 2.84 × 1014