TY JOUR TI A combined analysis of geomagnetic data and cosmic ray secondaries for the September 2017 space weather event studies KW Space weather events KW magnetic storms and substorms KW muon flux KW instruments and techniques KW generalized characteristic functions JO Russian Journal of Earth Sciences AU Sidorov, R.. AU Soloviev, A.A. AU Gvishiani, A.. AU Getmanov, V.. AU Mandea, M.. AU Petrukhin, A.. AU Yashin, I.. AU Obraztsov, A.. PY 2019 IS 19 PB Geophysical Center of the Russian Academy of Sciences