中文摘要：

我们介绍二个方法在太阳的活动检测短时期的变化。这些被称为低频率变化(ALFF ) 的振幅和低频率变化(FALFF ) 的部分振幅。我们用这二个方法发现在短时期的变化和太阳的活动的 11 年的变化之间的积极关联。通过 ALFF，我们发现当 11 年的太阳的活动是集中的时，在一个短时期上的那项太阳的活动变得集中。短时期活动的 ALFF 价值作为二次的功能在太阳黑子数字与山峰变化。通过 FALFF，我们发现比率短时期光谱当太阳的活动的 11 年的时期是集中的时，到在太阳的活动的整个时期上的紧张的紧张将增加。短时期的 FALFF 值根据一个立方的函数在太阳黑子数字与山峰变化。用 ALFF，我们获得从 1860 ～ 2003 在 15 年的一个短时期上变化的太阳的活动的一个每年的系列，它显示出大约 22 年， 33 年， 11 年和一个世纪的明显的频率。这些短时期变化在太阳的活动与长期的变化显示出好关联。

英文摘要：

We introduce two methods to detect short-period variation in solar activity. These are called amplitude of low frequency fluctuation （ALFF） and fractional am- plitude of low frequency fluctuation （FALFF）. We find a positive correlation between short-period variation and 11-year variation of solar activity using these two methods. Through ALFF, we find that solar activity over a short period becomes intensive when the 11-year solar activity is intensive. The ALFF value of the short period activity varies with the peak in sunspot number as a quadratic function. Through FALFF we find that the ratio of short-period spectral intensity to intensity over the whole period of solar activity will increase when the 11-year period of solar activity is intensive. The short-period FALFF value varies with the peak in sunspot number according to a cubic function. Using ALFF, we obtain a yearly series of solar activity that varies over a short period of 1-5 yr from 1860 to 2003, which shows an obvious periodicity of about 22 yr, 33 yr, 11 yr and a century. These short period variations show good correlations with long term variations in solar activity.