Only on rare occasions do the thermodynamics work; the fluid motions and the magnetic field all evolve in a compatible manner, so the new dipole polarity can diffuse in and establish a reversed magnetic field.

• 只有在很少的情况下热力学才发挥作用，此时流体运动和磁场都会以相互访调的方式演化，这样新的偶极性就会散开并建立一个倒转的磁