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Differential rotation of the sun determined tracing sunspots and oscillations of sunspot tilt angle

机译：太阳的旋转差决定了追踪黑子和黑子倾斜角的振荡

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摘要

The time and spatial characteristics of 324 large sunspots (S≥50 millionths of the solar hemisphere) selected from the Abastumani Astrophysical Observatory photoheliogram collection (1950–1990) have been studied. The variations of sunspot angular rotation velocity residuals and oscillations of sunspot tilt angle were analyzed. It has been shown that the differential rotation rate of selected sunspots correlates on average with the solar cycle. The deceleration of differential rotation of large sunspots begins on the ascending arm of the activity curve and ends on the descending arm reaching minimum near the epochs of solar activity maxima. This behavior disappears during the 21st cycle. The amplitudes and periods of sunspot tilt-angle oscillations correlate well with the solar activity cycle. Near the epochs of activity maximum there appear sunspots with large amplitudes and periods showing a significant scatter while the scatter near the minimum is rather low. We also found evidence of phase difference between the sunspot angular rotation velocity and the amplitudes and periods of tilt-angle oscillations.
机译：研究了从阿巴斯图曼尼天体物理天文台光日照图集合（1950年至1990年）中选出的324个大黑子（太阳半球的S≥50百万分之一）的时间和空间特征。分析了黑子角旋转速度残差的变化和黑子倾角的振荡。已经表明，所选黑子的不同旋转速率与太阳周期平均相关。大黑子的旋转差的减速开始于活动曲线的上升臂，结束于下降臂，在太阳活动最大值的时期附近达到最小值。此行为在第21个周期内消失。太阳黑子倾斜角振荡的幅度和周期与太阳活动周期有很好的相关性。在活动最大值的时期附近，出现了具有大振幅和周期的黑子，这些斑点显示出明显的散射，而接近最小值的散射则相当低。我们还发现了黑子角旋转速度与倾斜角振荡的幅度和周期之间存在相位差的证据。

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  • 来源
    《Solar Physics》 |2002年第2期|219-228|共10页
  • 作者

    E.V. Khutsishvili; M. Sh. Gigolashvili; T.M. Kvernadze;

  • 作者单位

    Town Department of Solar Physics Abastumani Astrophysical Observatory;

    Town Department of Solar Physics Abastumani Astrophysical Observatory;

    Town Department of Solar Physics Abastumani Astrophysical Observatory;

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