Fig. 7.
From: IGRF candidate models at times of rapid changes in core field acceleration
Observatory definitive (prior to epoch 2009.0) and quasi-definitive (after 2009) monthly mean values for dX/dt (left), dY/dt (middle), and dZ/dt at BOX, CLF, MBO, and PPT observatories selected for their geographical location. Black circles are yearly mean values computed from CHAOS-2s model and the red diamonds indicate the SV predictions of our SV-09 model extrapolated to 2010.0 with the help of our SA-09 model.