这种变化与地球磁场曾经发生过的变化相比还算温和的——有时地球磁场会完全翻转，地磁北极和地磁南极会对调。
These changes are mild compared to what Earth's magnetic field has done in the past - sometimes the field completely flips, with the north and the south poles swapping places.
这种变化与地球磁场曾经发生过的变化相比还算温和的——有时地球磁场会完全翻转，地磁北极和地磁南极会对调。
These changes are mild compared to what Earth's magnetic field has done in the past —sometimes the field completely flips, with the north and the south poles swapping places.
NASA宣称更多的地磁暴发生在春秋两季，在这段时间内，是观察北极光或南极光的绝佳时机(如果你足够幸运的处于一个能够观察到它们的地区！)
NASA says that more geomagnetic storms occur in the fall and spring, and this is a great time for viewing the aurora borealis or australis (if you're lucky enough to be in an area where it's visible!)
地球的地磁北极和南极随时间作周期性的变换，或许是地核内部流体运动的结果。
The periodic switching of the magnetic north and south poles of the Earth throughout time, probably as a result of movement of fluid within the Earth's core.
紧接着第二天，2011.9.10，地磁模拟器(241期新闻简报有解释)显示了地球南极再次消失。
And the following day, on September 10, 2011, the Magnetic Simulator (explained in Issue 241 of this newsletter) showed the Earth's s Pole once again disappearing.
紧接着第二天，2011.9.10，地磁模拟器(241期新闻简报有解释)显示了地球南极再次消失。
And the following day, on September 10, 2011, the Magnetic Simulator (explained in Issue 241 of this newsletter) showed the Earth's s Pole once again disappearing.
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