Fig. 13From: First results from the Swarm Dedicated Ionospheric Field Inversion chainEvolution with UT and season of the difference between the LT of the current system focus (defined as the point where the current function \({\varPsi }_1\) takes its maximum absolute value) and noon in each hemisphere. A positive value indicates that the current system is trailing behind the noon meridian, while a negative value indicates that it is leading it. \(F_{10.7}=100\)Â SFUBack to article page