太阳活动的周期为十一年，在这个周期里太阳活动包括太阳黑子、耀斑、磁场活动循环起伏。
Activity on the sun goes through cycles lasting about 11 years during which sunspots, flares and magnetic activity rise and fall.
太阳活动的周期为十一年，在这个周期里太阳活动包括太阳黑子、耀斑、磁场活动循环起伏。
Activity on the sun goes through cycles lasting about 11 years during which sunspots, flares and magnetic activity rise and fall.
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