表明奇怪的事情正在发生的第二项研究检查了太阳黑子的活力。
Matthew Penn and William Livingston have analysed 13 years of data which indicate that,independently of the number of spots around, there has been a decrease in their strength.
马修佩恩威廉利文斯敦已独立见解地分析了大致太阳黑子数的13年的数据表明这些黑子的活力已经下降了。
Sunspots are caused by irruptions into its surface of the sun s deeper magnetism.
太阳黑子是由入侵活动进入太阳深层磁性表面造成的。
These create local drops in temperature, which make the surface gas darker.
这些入侵活动导致了局部气温下降,使得太阳表面气体颜色更深。
Over the period which Dr Penn and Dr Livingston analysed, the average magnetic strengthof the irruptions has declined.
佩恩和利文斯顿博士分析表明,入侵活动的平均磁场强度已有所下降。
Below a certain threshold, they will not be strong enough to overcome the convectivemixing of the gas at the surface, and spots will disappear altogether.
低于一定的临界值的话,它们将不足以克服表面气体的对流混合,因而太阳黑子将完全消失。
If the present trend continues, that will happen in 2021.
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