On the ground, telescopes and optical instruments are used to record the number of sun spots, as well as to observe aurora, which provide evidence of geomagnetic storms.

 
  • 在地面上的观测,主要利用望远镜及光学仪器去记录太阳黑子的数目,而极光的观测则能提供地磁暴出现的证据。
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