论文标题
太阳活动和短暂区域的旋转速率-II。旋转速率的时间变化
The rotation rate of solar active and ephemeral regions -- II. Temporal variations of the rotation rates
论文作者
论文摘要
使用白光图像对黑子基团的旋转速率的系统研究产生了有争议的旋转速率变化结果：发现黑子基团的系统加速或系统地减速。这种分歧可能与用于探测黑子组旋转速率的方法的缺点有关。与以前的工作相反，在这项研究中，我们使用磁场图来分析活动区域旋转速率的变化。我们发现，在出现期间，活动区域可能表现出加速度或减速，而旋转速率在衰减过程中几乎保持不变。因此，我们假设没有系统的几何倾斜度倾斜到地下磁通环的顶端形成活性区域的径向方向。对单极和BI/多极活动区域的旋转速率进行了详尽的比较表明，衰减活性区域的旋转速率没有显着变化。与以前的工作相反，我们假定在出现后活跃区域演变过程中，旋转速率保持恒定（在预期的不确定性内）。
Systematic studies of the rotation rate of sunspot groups using white-light images yield controversial results on the variations of the rotation rate: sunspot groups were found to either accelerate or decelerate systematically. This disagreement might be related to shortcomings of the method used to probe the rotation rate of sunspot groups. In contrast to previous works, in this study we use magnetic field maps to analyse the variations of the rotation rate of active regions. We found that an active region may exhibit either acceleration or deceleration during the emergence while the rotation rate remains almost unchanged during decay. Hence, we suppose that there is no systematic geometrical inclination to the radial direction of the apex of the subsurface magnetic flux loop forming an active region. A thorough comparison of the rotation rate of unipolar and bi/multipolar active regions revealed no significant changes in the rotation rate of decaying active regions. In contrast to previous works, we presume the rotation rate to keep constant (within the expected uncertainties) during the evolution of an active region after emergence.
