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 KW plasmasphere KW model KW IRI KW IRI-Plas JO Solnechno-Zemnaya Fizika AU Gulyaeva, T.L. PY 2016 IS 2 PB INFRA-M Academic Publishing LLC.