The magnetic activity of stars like sun, which is the root cause of the sunspot cycle, is still poorly understood even after decades of intense study.
磁场的变化是像太阳这样的恒星表面黑子活动周期的根源，尽管经过几十年的认真研究之后，地球人仍然对其知之甚少。
Sunspot activity, which follows an 11-year cycle, is due to peak in 2013 after which it will start to wane slightly.
虽然以11年为周期的太阳黑子活动将在2013年达到顶峰之后，将缓慢衰落。
Before cycle 24 commenced, the position and strength of the torsional oscillation correctly predicted the late arrival of this cycle's sunspot activity.
在第24个周期开始前，人们通过太阳的扭转振动的位置和强度准确的预知了第24周期内太阳黑子活动的推迟。
The surface heating fields over QXP die down when sunspot cycle length(SCL) become long(the sun activity die down).
太阳黑子周期长度（SCL）变长（太阳活动减弱）时，青藏高原地面加热场强度减弱。
Solar flares rise and fall on an 11-year cycle, so scientists thought sunspot activity would pick up some time in 2008.
太阳耀斑的起起伏伏定在了11年的周期内，所以科学家以为太阳黑子会在08年里选个时间出来活动。
Solar flares rise and fall on an 11-year cycle, so scientists thought sunspot activity would pick up some time in 2008.
太阳耀斑的起起伏伏定在了11年的周期内，所以科学家以为太阳黑子会在08年里选个时间出来活动。
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