Previous prolonged weakenings in the solar cycle may have launched mini-Ice Ages.

早前在太阳周期中一个持续的周期可能带来了一个小冰河时代。

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Even with the solar cycle finally under way again, the number of sunspots has so far been well below expectations.

尽管太阳周期最终还是回到原来的样子，但是太阳黑子的数目却至今仍然低于预期。

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Most astronomers think that the solar cycle will proceed, but at significantly depressed levels of activity similar to those last seen in the 19th century.

大多数天文学家认为太阳活动周期会持续，但强度会发生严重的下滑，相比19世纪所看到的那样。

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The total energy reaching Earth from the sun rises and falls by just one tenth of one percent across this solar cycle.

VOA: special.2009.09.29

He argues that the most-cited climate models misjudge factors such as the effects of clouds, aerosols and the solar cycle.

ECONOMIST: ��The Skeptical Environmentalist��

DMI, Henrik Svensmark, reasoned that if the solar cycle were linked to the earth's temperature, cosmic rays could be part of the chain.

ECONOMIST: Global warming: In flux | The

Dan Hershman's life changed dramatically after he photographed a spectacular aurora in Washington state in 2000, which was a peak year in the solar cycle.

CNN: 'Dancing lights' draw thousands to frozen north