Figure 7. Electric currents (the left-hand side) and their magnetic fields (the right-hand side) for five elementary current systems. From top to bottom: the screening currents of the Earth dipole and the ring current at the magnetopause; the symmetric ring current; the current system consisting of the current across the magnetospheric tail and the short-circuiting currents at the magnetopause; the field-aligned currents of zone 1; the field-aligned currents of zone 2.