Fig. 11
From: Prediction of global ionospheric VTEC maps using an adaptive autoregressive model
Bias of the differences between forecasting VTEC maps, final GIMs, and J2TEC in 2009 and 2015. The red, blue, green, and magenta dotted lines depict the bias of the final IGS GIMs, the final CODE GIMs, the CODE forecasting VTEC maps, and forecasting products by proposed adaptive AR model, respectively, compared to VTEC values derived from JASON data. a Bias of VTEC maps minus J2TEC in 2009. b Bias of VTEC maps minus J2TEC in 2015