Fig. 5
From: Determining polar ionospheric electrojet currents from Swarm satellite constellation magnetic data
Temporal development of the sheet current densities measured from satellite Alpha as a function of QD latitude and time (bottom two panels) along with the corresponding Kp and AE index values (top panel). The middle panel shows the results for the Northern Hemisphere, and the bottom panel shows the results for the Southern Hemisphere. The results are given for the period around the St. Patrick’s day storm on 17 March 2015 (8 to 31 March 2015). A positive current corresponds to a sunward current