Fluid motions try to reverse the field on a few thousand years timescale,but the solid inner core tries to prevent reversals because the field cannot change (diffuse) within the inner core as quickly as in the fluid,outer core.
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释义
尽管流体运动会在几千年的时间尺度上使磁场倒转,但因为磁场的变化(扩散)在内核里不能与在外核的流体中一样快,所以固体的内核会尽力阻止倒转。
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