Fig. 8.

Global maps of MIO ionospheric E-region equivalent current functions at vernal equinox at different universal times (UT) as recovered by the CI algorithm. Each map is centered on noon magnetic local time. The current functions exist in a sheet at 110 km altitude. Current flows in a counter-clockwise (clockwise) direction in the northern (southern) hemisphere with a 10 kA current flowing between each contour. The dip equator is shown in blue.