Some statistical relationships between coronal holes and prominence in solar active cycle 21 are analysed.

分析了太阳活动21周冕洞和日珥之间的一些统计关系。

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Others predicted that it would be the most active solar cycle on record.

其他学者则预测这将会是有记录以来太阳周期中活动最频繁的一次。

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The latest solar cycle was supposed to be the most active on record.

人们断定最近一次的太阳周期将会是有记录以来活动最频繁的一次。

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The sun is currently in an active phase of its 11-year solar cycle, and it should continue to fire off big storms for a while yet.

MSN: Amazing video captures magical-looking sun storm

The sun is in an active phase of its current 11-year weather cycle, which scientists call Solar Cycle 24.

MSN: Big sunspot unleashes an intense solar flare