On November 3-4 2021, an interplanetary coronal mass injection (ICME) hits the magnetosphere, sparking a strong G3-class geomagnetic storm and auroras as far south as California and New Mexico. All detectors of the SEVAN network registered a Forbush decrease (FD) of 5-10 percentdeep in 1 minute time series of count rates. We present the results of a comparison of Fd registered on mountain 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 different coincidences of SEVAN detector layers on Aragats. We demonstrate disturbances of the near-surface electric (NSEF) and geomagnetic fields at the arrival of the ICME on Earth.
Cite
@article{arxiv.2212.13514,
title = {Forbush decrease observed by SEVAN particle detector network on November 4, 2021},
author = {A. Chilingarian and G. Hovsepyan and H. Martoyan and T. Karapetyan and B. Sargsyan and N. Nokolova and H. Angelov and D. Haas and J. Knapp and M. Walter and O. Ploc and J. Shlegl and M. Kakona and I. Ambrosova},
journal= {arXiv preprint arXiv:2212.13514},
year = {2022}
}