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On November 3-4 2021, an interplanetary coronal mass injection (ICME) hitsthe magnetosphere, sparking a strong G3-class geomagnetic storm and auroras asfar south as California and New Mexico. All detectors of the SEVAN networkregistered a Forbush decrease (FD) of 5-10 percentdeep in 1 minute time seriesof count rates. We present the results of a comparison of Fd registered onmountain altitudes on Aragats (Armenia), Lomnicky Stit (Slovakia), Musala(Bulgaria), and at sea level DESY (Hamburg, Germany), and in Mileshovka,Czechia. We present as well purity and barometric coefficients of differentcoincidences of SEVAN detector layers on Aragats. We demonstrate disturbancesof the near-surface electric (NSEF) and geomagnetic fields at the arrival ofthe ICME on Earth.

Forbush decrease observed by SEVAN particle detector network on November 4, 2021