太阳黑子活动周期
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sunspot activity cycle
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But in the current cycle, sunspot activity has collapsed.
FORBES: To The Horror Of Global Warming Alarmists, Global Cooling Is Here
Sunspot activity waxes and wanes on the sun in a 11-year cycle, and we are approaching the peak of sunspot activity, probably reaching it in 2013, according to Hesse.
FORBES: Huge Solar Flares Could Spell Catastrophe for Earth
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