Stream function representing the equivalent sheet current density associated with the primary magnetic field from the xDIFI-2 model on April 1 at UT = 00:00, 06:00, 12:00, and 18:00. A current of 10 kA flows between adjacent contours. The dip equator is indicated by a thick black line. Each map is centered on the subsolar point at the corresponding UT. The F10.7 is arbitrarily fixed at 100 SFU.