超颗粒尺度下的磁性图案：空隙尺寸分布
Magnetic pattern at supergranulation scale: the Void Size Distribution
摘要：
宁静太阳的大尺度磁场图案由磁网络主导。这个网络，由光球磁场扫入对流下降流，描绘了翻转等离子体的大尺度细胞的边界，并表现出磁组织的空隙。这种空隙包括网络间场，一种填充网络单元内部的混合极性稀疏场。为了挑出空洞，并量化其内在的模式，一个快速的圆包装为基础的算法被应用到511 SOHO/MDI高分辨率磁图期间获得的杰出的太阳活动最低的23和24个周期之间。计算出的空隙分布函数在10-60微米范围内表现出准指数衰减行为。在这样的范围内缺乏明显的流动尺度证实了太阳表面多尺度运动流动的假设。除了准指数衰减之外，我们还发现空洞在35 μ m附近偏离了简单的指数衰减。
英文摘要：
The large-scale magnetic pattern of the quiet sun is dominated by the magnetic network. This network, created by photospheric magnetic fields swept into convective downflows, delineates the boundaries of large scale cells of overturning plasma and exhibits voids in magnetic organization. Such voids include internetwork fields, a mixed-polarity sparse field that populate the inner part of network cells. To single out voids and to quantify their intrinsic pattern a fast circle packing based algorithm is applied to 511 SOHO/MDI high resolution magnetograms acquired during the outstanding solar activity minimum between 23 and 24 cycles. The computed Void Distribution Function shows a quasi-exponential decay behavior in the range 10-60 Mm. The lack of distinct flow scales in such a range corroborates the hypothesis of multi-scale motion flows at the solar surface. In addition to the quasi-exponential decay we have found that the voids reveal departure from a simple exponential decay around 35 Mm.
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