In addition to the evident 11-year periodic changes, Total solar irradiance (TSI) also has some short-period processes. We carried out the wavelet analysis for TSI observational series and its inter-annual time series that is filtered out components less than 2 years and more than 8 years . Whether the wavelet graph or the global wavelet power spectrum, the results significantly show that there is a short period about 5.3 years, and its length and intensity both vary with time. Specifically, the strength of this period varies with the 11-year cycle change, showing pronounced characteristics of peak strength and valley weakness. Moreover, the amplitude of these low-frequency fraction results indicates different TSI variation properties. Under each solar cycle, the sum of the power spectrum density of the 3–6 year period terms reflects that the energy value of the short period is concentrated in that range. When the 11-year cycle is intensive, the 3–6 year period also becomes intensive in TSI. And the total spectral intensity of TSI will be concentrated in that short-period terms.

中文翻译：

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确定总太阳辐照度的短期项

除了明显的 11 年周期变化外，总太阳辐照度 (TSI) 也有一些短周期过程。我们对TSI观测序列及其年际时间序列进行了小波分析，过滤掉了小于2年和大于8年的分量。无论是小波图还是全局小波功率谱，结果都显着地表明存在5.3年左右的短周期，其长度和强度均随时间变化。具体而言，这一时期的强度随11年周期变化而变化，呈现出明显的峰强谷弱特征。此外，这些低频部分结果的幅度表明了不同的 TSI 变化特性。在每个太阳周期下，3-6年期的功率谱密度总和反映了短期的能量值集中在该范围内。当 11 年周期密集时，TSI 的 3-6 年周期也变得密集。而 TSI 的总光谱强度将集中在那个短期内。