An Influence of Geomagnetic Field on Stimulated and Free Oscillations in Schumann Resonator

Penetration of electric and magnetic fields of the first global electromagnetic ELF resonance in the cavity Earth- ionosphere into the ionosphere is investigated numerically. In the case of stimulated oscillations possessing the real frequency a penetration height for magnetic components is 2 - 3 times greater than for electric ones and it depends essentially on the value of the geomagnetic field and its orientation with respect to the normal to the Earth´s surface. A penetration height for the electric field is of about 50-70 km, for the magnetic field it is 120-240 km. In the case of free oscillations the frequency is complex, and the quality factor of the mode can be estimated from the condition of minimal leakage of magnetic components.