Schematic illustrating the magnetic field structure generated by bipolar radial currents, representative of those observed in panel (d) of Figure B.2. The violet symbols (⊙ and ⊗) denote current flowing out of and into the plane, respectively. The black circular arrows depict the induced magnetic field loops. The superposition of these fields between the current poles is indicated by red arrows. The triad of spherical coordinate system unit vectors (B_r, B_θ, B_ϕ) shown to the right of the figure.