TY JOUR TI Analysis of helio- and geophysical events in October–November 2021 from comprehensive observations of SHICRA SB RAS KW solar flare KW magnetic storm KW Forbush decrease KW aurora KW auroral arc KW neutron monitor KW ionosonde KW riometer KW receiver of VLF radio noise and signals from navigation radio stations KW magnetometers JO Solnechno-Zemnaya Fizika AU Kozlov, V.I. AU Starodubtsev, S.A. AU Grigoryev, V.G. AU Baishev, D.G. AU Makarov, G.A. AU Pavlov, E.A. AU Karimov, R.R. AU Korsakov, A.A. AU Stepanov, A.E. AU Koltovskoi, I.I. AU Ammosov, P.P. AU Gavrilieva, G.A. AU Ievenko, I.B. PY 2025 IS 11 PB INFRA-M Academic Publishing LLC.