Fig. 12
From: Prediction of global ionospheric VTEC maps using an adaptive autoregressive model
RMS 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 RMS of differences between the final IGS GIMs, the final CODE GIMs, the CODE forecasting VTEC maps, and forecasting products by proposed adaptive AR model, respectively, and the VTEC values derived from JASON data. a RMS of VTEC maps minus J2TEC in 2009. b RMS of VTEC maps minus J2TEC in 2015