太阳活动周23-24期间太阳作为恒星总辐照度的Rieger型周期性
Rieger-type periodicity in the total irradiance of the Sun as a star during solar cycles 23-24
摘要：
上下文总的太阳辐照度允许使用太阳作为一颗恒星来研究最近空间飞行任务中恒星光变曲线的观测。目的。我们的目标是研究如何在太阳活动指数中观察到的中期周期性影响太阳总辐照度。方法.利用SATIRE-S和SOHO/VIRGO资料，研究了太阳活动周23-24期间太阳总辐照度在Rieger型周期时间尺度上的周期性变化。然后，我们比较了太阳总辐照度振荡的功率谱，太阳黑子和光斑数据，以确定其贡献。结果TSI数据的小波分析显示，在第23个周期中，强峰值出现在180天和115天，而第24个周期显示170天和145天的周期。太阳黑子和光斑数据中有几个时期在太阳总辐照度中看不到，因为它们可能通过同时变亮（光斑）和变暗（太阳黑子）而相互抵消。Rieger型周期性可能是由内部发电机层中的磁Rossby波引起的，其中太阳周期性磁场产生。因此，观测到的太阳总辐照度周期和波色散关系使我们能够估计发电机磁场强度为10-15 kG。结论.太阳总辐照度可以用来估算发电机层的磁场强度。这一工具在利用空间飞行任务获得的光变曲线估计类太阳恒星的发电机磁场强度方面具有重要意义。
英文摘要：
Context. Total solar irradiance allows for the use of the Sun as a star for studying observations of stellar light curves from recent space missions. Aims. We aim to study how the mid-range periodicity observed in solar activity indices influences the total solar irradiance. Methods. We studied periodic variations of total solar irradiance based on SATIRE-S and SOHO/VIRGO data during solar cycles 23-24 on timescales of Rieger-type periodicity. Then we compared the power spectrum of oscillations in the total solar irradiance to those of sunspot and faculae data to determine their contributions. Results. Wavelet analyses of TSI data reveal strong peaks at 180 days and 115 days in cycle 23, while cycle 24 showed periods of 170 days and 145 days. There are several periods in the sunspot and faculae data that are not seen in total solar irradiance as they probably cancel each other out through simultaneous brightening (in faculae) and darkening (in sunspots). Rieger-type periodicity is probably caused by magneto-Rossby waves in the internal dynamo layer, where the solar cyclic magnetic field is generated. Therefore, the observed periods in the total solar irradiance and the wave dispersion relation allow us to estimate the dynamo magnetic field strength as 10-15 kG. Conclusions. Total solar irradiance can be used to estimate the magnetic field strength in the dynamo layer. This tool can be of importance in estimating the dynamo magnetic field strength of solar-like stars using light curves obtained by space missions.
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