TY JOUR TI Modification of the solar activity indices in the International Reference Ionosphere IRI and IRI-Plas models due to recent revision of sunspot number time series KW Global electron content KW Sunspot number KW Solar radio flux KW Ionosphere ยท Plasmasphere KW Models IRI KW IRI-Plas JO Solar-Terrestrial Physics AU Gulyaeva, T.L. PY 2016 IS 2 PB INFRA-M Academic Publishing LLC.