Geomagnetic activity, the natural variations in Earth's magnetic field, it fluctuates in 11-year cycles.

地磁活动是地球磁场的自然变化，其波动周期为11年。

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At the Earth's surface, these tempests can be detected by changes in the strength of the Earth's magnetic field.

在地球表面，可以通过改变地球磁场强度来检测这些风暴。

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The Earth's magnetic field is generated as the molten iron of the Earth's outer core revolves around its solid inner core; when surges in the molten iron occur, magnetic tempests are created.

地球磁场是由地球外核的熔铁围绕固体内核旋转而产生的；当铁水激增，就会发生磁暴。

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But gamma-ray telescopes are also confused by charged particles trapped in the earth's magnetic field.

ECONOMIST: A new gamma-ray telescope has just been launched

But because these particles are electrically charged, they also interact with the Earth's magnetic field.

ECONOMIST: The search for dark matter: Ethereal yet weighty | The

In addition, it is further evidence that the great fish can navigate, possibly using the Earth's magnetic field.

BBC: Sharks navigate using 'mental maps'