... 日斑 ; 太阳黑子 sun-spot 日斑周;太阳黑子周 sun-spot cycle 日斑指数 sun-spot index number ...
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sun spot cycle 太阳黑子活动周期
sun spot eleven year cycle 太阳黑子年周期
·2,447,543篇论文数据，部分数据来源于NoteExpress
Climate scientists have already looked at changes related to Sun spot activity - a cycle of approximately 11 years - and long-term changes in the Sun's brightness, which has a cycle that lasts for centuries.
BBC: Viewpoint: The Sun and climate change
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