超颗粒细胞的三维光球速度场
3D photospheric velocity field of a Supergranular cell
摘要：
研究了超颗粒（SG）胞内等离子体的流动特性，特别是它与小尺度磁场结构的相互作用。SG细胞已被确定使用的磁网络（CaII翼亮度）作为代理，应用两级结构跟踪（TST）的高空间，光谱和时间分辨率的观测IBIS。在两个不同的光球高度上重建了SG的全三维速度矢量场。为了加强我们的研究结果，我们还计算了平均径向流量的SG通过软木跟踪。我们还研究了水平和视线等离子体流的行为与集群的明亮的CaII结构的磁起源，以更好地了解光球对流和小尺度磁功能之间的相互作用。我们研究的SG细胞似乎是有组织的，从中心到边界几乎是放射状的流动。大规模的发散结构可能是由一个紧凑的区域不断上升的细胞中心附近。在SG的边缘，强会聚流的孤立区域与形成磁网络结的明亮的CaII翼特征的扩展集群在附近或同空间。
英文摘要：
We investigate the plasma flow properties inside a Supergranular (SG) cell, in particular its interaction with small scale magnetic field structures. The SG cell has been identified using the magnetic network (CaII wing brightness) as proxy, applying the Two-Level Structure Tracking (TST) to high spatial, spectral and temporal resolution observations obtained by IBIS. The full 3D velocity vector field for the SG has been reconstructed at two different photospheric heights. In order to strengthen our findings, we also computed the mean radial flow of the SG by means of cork tracing. We also studied the behaviour of the horizontal and Line of Sight plasma flow cospatial with cluster of bright CaII structures of magnetic origin to better understand the interaction between photospheric convection and small scale magnetic features. The SG cell we investigated seems to be organized with an almost radial flow from its centre to the border. The large scale divergence structure is probably created by a compact region of constant up-flow close to the cell centre. On the edge of the SG, isolated regions of strong convergent flow are nearby or cospatial with extended clusters of bright CaII wing features forming the knots of the magnetic network.
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