Fig. 4From: Inter-hemispheric imaging of the ionosphere with the upgraded IRI-Plas model during the space weather stormsObservations of the F2-layer critical frequency at source stations (left panel) and model reconstruction in the conjugate hemisphere (right panel) during the ionosphere-plasmasphere storm on 15 December, 2006, at the solar minimum. The solid line indicates the median values, and the dashed line denotes the instant valuesBack to article page