Assessment of Dynamic mode decomposition (DMD) model for Ionospheric TEC map predictions

In this study, we assess the Dynamic Mode Decomposition (DMD) model applied with global ionospheric vertical Total Electron Content (vTEC) maps to construct a 24-hours global Ionospheric vTEC map forecast using 2-hours temporal resolution maps. In addition, we examine the impact of EUV time series data source in a theoretical manner with the DMD control (DMDc) framework, which shows an improvement in the vTEC Root Mean Square Error (RMSE) values compare with the International GNSS Service (IGS) final solution VTEC maps. Both the DMD and DMDc predictions present close RMSE scores compared with the available CODE’S 1-day predicted ionospheric maps, both for quiet and disturbed solar activity. Finally, we evaluate the predicted global Ionospheric vTEC maps with the East-North-Up (ENU) coordinate system errors metric, as an Ionospheric correction source for a single frequency GPS/GNSS Single Point Positioning (SPP) solution. Based on these findings, we argue that the commonly adopted vTEC map comparison RMSE metric fails to correctly reflecting an informative impact on single frequency positioning solutions using a dual frequency Ionospheric corrections.

Check the source code github.com/vladlanda.