Can Resonant Oscillations of the Earth Ionosphere Influence the Human Brain Biorhythm?

Within the frames of Alfv\'en sweep maser theory the description of morphological features of geomagnetic pulsations in the ionosphere with frequencies (0.1-10 Hz) in the vicinity of Schumann resonance (7.83 Hz) is obtained. It is shown that the related regular spectral shapes of geomagnetic pulsations in the ionosphere determined by "viscosity" and "elasticity" of magneto-plasma medium that control the nonlinear relaxation of energy and deviation of Alfv\'en wave energy around its equilibrium value. Due to the fact that the frequency bands of Alfv\'{e}n maser resonant structures practically coincide with the frequency band delta- and partially theta-rhythms of human brain, the problem of degree of possible impact of electromagnetic "pearl" type resonant structures (0.1-5 Hz) onto the brain bio-rhythms stability is discussed.