TY JOUR TI Ionospheric influences on GPS signals in terms of range delay KW Ionosphere KW range delay KW TEC KW geomagnetic storm JO Russian Journal of Earth Sciences AU Mansoori, A.. AU Khan, P.. AU Atulkar, R.. AU Purohit, P.K. AU Gwal, A.K. PY 2015 IS 15 PB Geophysical Center of the Russian Academy of Sciences