描述: 太阳周期是指太阳黑子、太阳耀斑和太阳上其他形式活动的大约 11 年一个周期。这种活动是由太阳总体磁场产生的。由于该磁场每 11 年在南北两极之间切换一次，因此太阳的磁极需要22 年的时间才能恢复到原来的状态。

相关词条

• 太阳
• 太阳黑子周期
• 磁场
• 恒星活动

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