Space Science Reviews,
Vol. 111, Iss. 1, pp. 1-32, doi: 10.1023/B:SPAC.0000032719.40094.1d, March 2004.
Figure 5: Magnetic field above some simple sources (red labels for +z direction of magnetization, blue for +x ) (a) dipole source, equivalent to a uniformly magnetized sphere, at depth d (b) infinite line of dipoles, or uniformly magnetized cylinder, at depth d (c) uniformly magnetized thin plate, at depth 0.1d.