与铁屑和磁棒对称整齐的磁场模式不同，地球磁层面向太阳的一面被向内推，在相反的方向上延伸出磁场的轨迹。

Unlike the symmetrical pattern of the iron filings and magnet, the magnetosphere is pushed in on the side facing the Sun and stretched out in the Earth's wake.

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随着磁场减弱，太阳黑子的数量会减少到最小值或者说最低点(波谷)，然后太阳的磁场就会反方向运动，开始重新变强。

As the field wanes, the number of sunspots falls to a trough or minimum, at which point the sun's magnetic field reverses direction and starts to regain its strength.

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看不见太阳时，它们会依据地球的磁场采用某种特殊的方法来感知方向。

When they cannot see the sun, they use some special way to sense direction from the earth's magnetic field.

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