So the rare field reversals are most likely caused by larger changes in the flow in the outer core,or in the way in which the field lines are wound into the flow by diffusion.

• 这样，不经常发生的磁场倒转，很可能是由外核流体或磁场曲线通过扩散宛然进人流体方式发生较大的变化而引起的。