On the Patterns of the Solar Granulation and Supergranulation
On the Patterns of the Solar Granulation and Supergranulation
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DOI：
10.1086/303528
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发表时间：
1997-01
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影响因子：
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通讯作者：
C. Schrijver;H. Hagenaar;A. Title
中科院分区：
文献类型：
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作者：
C. Schrijver;H. Hagenaar;A. Title
我们研究的细胞模式的白色轻颗粒和色球Ca II K超颗粒网络。我们应用基于梯度的镶嵌算法来定义细胞轮廓。尽管在长度尺度上有很大的差异，但由相关的颗粒流和超颗粒流形成的图案的几何形状非常相似。我们比较这些模式广义Voronoi泡沫，并得出结论，这两种对流模式是非常接近兼容的一个基本上随机分布的上流中心，与下流边界确定的竞争强度的流出相邻的uppermos。似乎有一个轻微的聚集在上流位置的颗粒，与颗粒的演变。大颗粒被稍小的颗粒包围的这种轻微的偏好使得颗粒和超颗粒图案有足够的差异，允许在四分之三的情况下通过眼睛进行正确的识别。模型类比表明，外流强度的范围非常小。这些模式似乎对形成下向流网络模式的竞争力的细节不太敏感：在非常不同的条件下会产生类似的模式，因此，仅通过研究这些模式的几何形状，几乎无法了解所涉及的力的细节。
We study the cellular patterns of the white light granulation and of the chromospheric Ca II K supergranular network. We apply a gradient-based tessellation algorithm to define the cell outlines. The geometry of the patterns formed by the associated granular and supergranular flows are very similar, in spite of the substantial difference in length scale. We compare these patterns to generalized Voronoi foams and conclude that both convective patterns are very nearly compatible with an essentially random distribution of upflow centers, with the downflow boundaries determined by the competing strengths of outflows of neighboring upwellings. There appears to be a slight clustering in upflow positions for the granulation, consistent with the granular evolution. This slight preference for large granules to be surrounded by somewhat smaller ones makes the granular and supergranular patterns differ enough to allow a correct identification in three out of four cases by eye. The model analogy suggests that the range in outflow strengths is remarkably small. The patterns appear to be rather insensitive to the details of the competing forces that establish the pattern of the downflow network: similar patterns result under very different conditions, so that little can be learned about the details of the forces involved by studying the geometry of these patterns only.