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— Data obtained with a Hall sensor magnetic field detector have been used to record the spectral components of the geomagnetic field. An analysis of the spectral characteristics of geomagnetic oscillations has shown that the variations identified in the vicinity of the strong magnetic storm on November 4, 2021, are oscillations of the “pearl” type, i.e., Pc 1 biotropic geomagnetic pulsations. Pearls were also observed in the vicinity of some weak magnetic storms in 2021–2022, including in the absence of magnetic disturbances. At the same time, they were not observed during the passage of some strong magnetic storms. Thus, it is not entirely correct to state that the human body is adversely affected only in magnetically disturbed periods.

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