地球的磁场效应不仅能够指引指南针，还能够将其效应延伸至宇宙空间来指引地球四周的太阳风的流向，这样就形成了一种称为“磁气圈”的结构(如上图所示)。

Besides directing compasses, the Earth's magnetic field reaches out into space to direct the flow of the solar wind around the planet-forming a structure called the magnetosphere (depicted above).

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