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.

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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.

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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!)

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