The results of the superposed epoch analysis for the vTEC and foF2 storm-time response in case the observation point is located in the morning LT sector at the storm onset, for MtH (top panel) and MtL (bottom panel) locations. The predictions that the original SWIF’s expressions can provide is also included (green line). Error bars represent standard deviations. The vertical black line at 0 hrs indicates the storm onset time.