Schematic illustrations explaining the generation of anti-Joy’s law tilt and the morphological asymmetry of the field strengths the BMRs. (a) Cross-section at the surface seen from the top. The red and blue arrows show the directions of the Lorentz force and the Coriolis force, respectively. (b) Cross-section at the fixed latitude seen from the equator to the north pole. (c) Three-dimensional view of the evolution of a BMRs.