南腿系的旋转跟它下面的N极主黑子的旋转方向一致，表明两者之间可能存在着某种内在的联系。

The rotational direction of the southern leg system was in accordance with that of the main sunspot with N-polarity below it, which shows that there may be some internal relation between the two.

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从谱分析结果判断，年降水量具有20年的主振荡周期和3.3年、2.2年的次周期，并出现与太阳黑子变化反位相的特征。

Spectrum analysis is also conducted with the result that the significant period is about 20 years and the sub-period are 2.2 and 3.3 years.

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从谱分析结果判断，年降水量具有20年的主振荡周期和3.3年、2.2年的次周期，并出现与太阳黑子变化反位相的特征。

Spectrum analysis is also conducted with the result that the significant period is about 20 years and the sub-period are 2.2 and 3.3 years.

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