Data on solar hydrogen filaments obtained at the Abastumani Astrophysical Observatory during solar activity cycles 19-22 are used to study the characteristic periods of the solar differential rotation. In addition to the known 11-year period of solar activity, a quasi-biennial periodicity was revealed for the rotation rates of hydrogen filaments and a quasi-five-year periodicity was also found for the number of hydrogen filaments.

中文翻译：

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太阳微分自转周期的研究

在太阳活动周期 19-22 期间在 Abastumani 天体物理天文台获得的太阳氢丝数据用于研究太阳微分旋转的特征周期。除了已知的 11 年太阳活动周期外，还揭示了氢丝旋转速率的准两年周期，并且还发现了氢丝数量的准五年周期。