TY JOUR TI New Regional Geomagnetic Indices for the Russian Sector of the Geomagnetic Observation Network KW Geomagnetic indices KW substorm KW geomagnetic variations KW geoinduced currents JO Russian Journal of Earth Sciences AU Vorobev, A.V. AU Pilipenko, V.A. AU Dobrovolsky, M.N. AU Kozyreva, O.V. AU Evdokimova, M.A. AU Kudin, D.V. PY 2026 IS 25 PB Geophysical Center of the Russian Academy of Sciences