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Complex observations at the geophysical observatory "Klyuchi" during a strong geomagnetic storm in September 2017

At the Geophysical Observatory "Klyuchi" (INGG SB RAS, Novosibirsk) complex geophysical observations are monitoring the variations of the flux of cosmic rays, the magnetic field of the Earth and the ionosphere. The report discusses the results of these observations during disturbances that arose in the near-Earth space after a series of events on the Sun in September 2017.