Ionospheric Non-Homogeneity Effects on TEC Calculation

The Ionosphere over Brazil is normally non-homogeneous, due to phenomena like the Equatorial Ionospheric Anomaly (EIA). Measurements of VTEC for one station can produce a TEC map that will not correspond to the true TEC if non-homogeneity is present. The effect of density gradients on TEC measurements is analyzed, using ionospheric models and real data.