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Within the frames of Alfv\'en sweep maser theory the description ofmorphological features of geomagnetic pulsations in the ionosphere withfrequencies (0.1-10 Hz) in the vicinity of Schumann resonance (7.83 Hz) isobtained. It is shown that the related regular spectral shapes of geomagneticpulsations in the ionosphere determined by "viscosity" and "elasticity" ofmagneto-plasma medium that control the nonlinear relaxation of energy anddeviation of Alfv\'en wave energy around its equilibrium value. Due to the factthat the frequency bands of Alfv\'{e}n maser resonant structures practicallycoincide with the frequency band delta- and partially theta-rhythms of humanbrain, the problem of degree of possible impact of electromagnetic "pearl" typeresonant structures (0.1-5 Hz) onto the brain bio-rhythms stability isdiscussed.

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