活动区11158内的发散水平次表层流
Divergent Horizontal Sub-surface Flows within Active Region 11158
摘要：
我们使用环形图技术和HMI高空间分辨率多普勒图测量了一个快速形成的活动区（NOAA 11158）的水平地下水流。该活动区具有复杂的磁结构，并在其磁盘通道的形态显示出显着的变化。在2011年2月11日至16日的6天内，总速度的大小的时间变化被发现遵循磁场强度的趋势。我们进一步分析了AR 11158内部的各个磁极性区域，发现这些子区域中的水平速度分量随时间和深度有显著的变化。前极性区和后极性区比混合极性区移动得更快。此外，纬向分量和纬向分量在所有深度的拖尾和前导极性区域具有相反的符号，表明活动区域内的发散流。我们还发现在大耀斑周围的深层总水平速度的大小急剧下降。这可能是由于耀斑期间磁场的重组和黑子的自转使水平流的大小减小，或者是水平流的动能转化为耀斑释放的能量。在耀斑活动和太阳黑子旋转减弱后，气流趋向于遵循磁活动的模式。我们还观察到，在表面附近的速度分量的变化较小，但这些往往增加与深度，进一步表明，更深的层更受活动区的拓扑结构的影响。
英文摘要：
We measure the horizontal subsurface flow in a fast emerging active region (NOAA 11158) using the ring-diagram technique and the HMI high-spatial resolution Dopplergrams. This active region had a complex magnetic structure and displayed significant changes in the morphology during its disk passage. Over the period of six days from 2011 February 11 to 16, the temporal variation in the magnitude of total velocity is found to follow the trend of magnetic field strength. We further analyze regions of individual magnetic polarity within AR 11158 and find that the horizontal velocity components in these sub-regions have significant variation with time and depth. The leading and trailing polarity regions move faster than the mixed-polarity region. Further, both zonal and meridional components have opposite signs for trailing and leading polarity regions at all depths showing divergent flows within the active region. We also find a sharp decrease in the magnitude of total horizontal velocity in deeper layer around major flares. It is suggested that the re-organization of magnetic fields during flares combined with the sunspot rotation decreases the magnitude of horizontal flows or that the flow kinetic energy has been converted into the energy released by flares. After the decline in flare activity and the sunspot rotation, the flows tend to follow the pattern of the magnetic activity.We also observe less variation in the velocity components near the surface but these tend to increase with depth, further demonstrating that the deeper layers are more affected by the topology of active regions.
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