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历史上地球磁极已反转数百次了。最近一次证据充足的事件（ｔｈｅＢｒｕｎｈｅｓ／Ｍａｔｕｙａｍａ反转）发生在大约７８万年前。磁极反转事件持续时间一般认为在１０００～６０００年之间，在此期间，地球表面磁场平均强度据估计减小为其通常值的约１／４。在磁极反转期...
Earth's magnetic pole has been inverted hundreds of times in history. The most recent evidence (the Brunhes / Matuyama reversal) occurred about 780,000 years ago. The duration of the pole reversal event is generally believed to be between 1000 and 6000 during which the average magnetic field strength on the Earth's surface is estimated to decrease to about a quarter of its normal value. In the magnetic reversal period ...