Kremenets'kyj I. EXCITATION OF ULTRA LOW FREQUENCY PERTURBATIONS IN NEAR-EARTH PLASMA.

Ultra low frequency perturbations in the ionosphere and mag-netosphere, which are excited by source current outside of plasma and magnetospheric plasma pressure. Methods - analyti-cal methods of theoretical physics, numerical simulations. The radiation zone in the ionosphere from 3D lithospheric current source is calculated. The spatial and frequency filtration char-acteristics of ionosphere are determined in the frequency range 0.01-100 Hz. The reflection of Alfven waves from the homoge-neous and inhomogeneous ionosphere are calculated. Three dimension eigenoscillations of finite pressure plasma in the dipole magnetic configuration was described analytically, its spectrum and stability are analyzed. The primary instable per-turbation and most instable region of magnetosphere are de-fined. The field of application is physics of space plasmas.