Open Access

Table A1

Acronyms (following order of appearance in the text).

GNSS Global Navigation Satellite System
S4 Amplitude Ionospheric Scintillation Index
IPP Ionospheric Pierce Point
LT Local Time
EIA Equatorial Ionization Anomaly
SBAS Satellite Based Augmentation System
GBAS Ground Based Augmentation System
GDA Matlab’s griddata or the python equivalent
EMBRACE Estudo e Monitoramento Brasileiro do Clima Espacial
INPE Instituto Nacional de Pesquisas Espaciais
IDW Inverse Distance Weighting
RBF Radial Basis Function
GPR Gaussian Process Regression
TEC Total Electron Content
PSD Power Spectral Density
INCT Institutos Nacionais de Ciência, Tecnologia e Inovação
GNSS-NavAer GNSS Technology for Supporting Aerial Navigation
LISN Low-Latitude Ionospheric Sensor Network
SMR Slant S4 values reduced by the maximum value at the grid point
SAR Slant S4 values reduced by the average value at the grid point
VMR Vertical S4 values reduced by the maximum value at the grid point
VMI Vertical S4 values reduced by the maximum value at the centroid
SMI Slant S4 values reduced by the maximum value at the centroid
VAR Vertical S4 values reduced by the average value at the grid point
VAI Vertical S4 values reduced by the average value at the centroid
SAI Slant S4 values reduced by the average value at the centroid
VQR Vertical S4 values reduced by the average value above the 3rd quartile at the grid point
VQI Vertical S4 values reduced by the average value above the 3rd quartile at the centroid
SQR Slant S4 values reduced by the average value above the 3rd quartile at the grid point
SQI Slant S4 values reduced by the average value above the 3rd quartile at the centroid
IGRF International Geomagnetic Reference Field
UT Universal Time
SSS Stratified Shuffle Split
LOGO Leave One Group Out
MAE Mean Absolute Error
RMSE Root Mean Square Error
MXAE Mean of Maximum Absolute Errors
MMIN Mean of Minimum Errors
MMAX Mean of Maximum Errors
STDA Standard Deviation of Absolute Error
CORR Pearson’s Correlation Coefficient

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