Relationship between the 3D-position error and the ionospheric scintillation for the 6 IGS receivers shown in Table 1, high latitude receivers are compared in the left panel and low latitude receivers are compared in the right panel. The comparison extends for more than 2 weeks of high ionospheric activity (see Sect. 2). The red points correspond to the first 2 h after the daily reset (convergence period) while the blue points correspond to the comparison during the rest of the day. The green squares depict the mean values of the 3D position error per bins of σ_ϕ (0.1, 0.3, 0.5 and greater than 0.6).