论文标题
太阳能球旋转
On the Rotation of the Solar Chromosphere
论文作者
论文摘要
旋转是太阳和其他恒星的重要特征，它在理解其发电机的作用和磁性活动中起着重要作用。在这项研究中，从全球观点研究了超过40年mg II指数的全球视角研究了太阳能层活性的旋转。我们用同步小波变换确定了时间变化的旋转时间长度（RPL），该变换提供了高时间和频率分辨率；此外，我们将RPLS与从Sunspot数字和10.7 cm无线电通量数据获得的光球和冠状RPL进行了比较。考虑到RPL的意义。我们发现，染色体的RPL和光球和电晕的RPL表现出向下的趋势。此外，他们在最近的四个太阳能最大值中的RPL也显示出趋势下降。它表明，在最近的四个太阳周期中，太阳大气的旋转一直在加速，这是由于太阳能活动强度的下降所致。太阳大气RPL的变化显示了太阳周期的多个谐波的周期性，并且由太阳能活动周期进行了调节。
Rotation is a significant characteristic of the Sun and other stars, and it plays an important role in understanding their dynamo actions and magnetic activities. In this study, the rotation of the solar chromospheric activity is investigated from a global point of view with an over 40 yr Mg II index. We determined the time-varying rotational period lengths (RPLs) with the synchrosqueezed wavelet transform which provides high temporal and frequency resolution; furthermore, we compared the RPLs with the photospheric and coronal RPLs obtained from the sunspot numbers and the 10.7 cm radio flux data. The significance of the RPLs is taken into consideration. We found that the RPLs of the chromosphere exhibit a downward trend, as do those that of the photosphere and corona; in addition, their RPLs at the recent four solar maxima also show a declining trend. It suggests that the rotation of the solar atmosphere has been accelerating during the recent four solar cycles, which is inferred to be caused by the declining strength of solar activity. The variations of the solar atmospheric RPLs show periodicities of multiple harmonics of the solar cycle period, and it is modulated by the solar activity cycle.
