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arXiv 1208.2160astro-ph.SRastro-ph.IM
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根据CaIIH亮粒间G-能带结构估算宁静太阳的磁通量

The quiet Sun's magnetic flux estimated from CaIIH bright inter-granular G-band structures

Burkart Bovelet, Eberhard Wiehr

摘要:

我们确定的数密度和面积的贡献,小规模的颗粒间钙-II明亮的G-能带结构的图像中的安静的太阳作为示踪剂的千高斯磁通量浓度。在一张149”x 117”的G波段图像中,在活动最小的圆盘中心,用“多级跟踪”模式识别算法“MLT_4”分割了7593个小的颗粒间结构“IGS "。连续谱与G波段亮度的散点图显示了已知的磁性和非磁性分支。这些分支在很大程度上解开了应用一个内在的钙II过剩标准。由此获得的2995个结构包含1152个G带亮点[BP ']和1843个G带暗点[FP']。它们表现出随着G带过剩减少而增加尺寸的趋势,正如从“热壁”图中所预期的那样。它们的Ca-H和G带亮度略有相关,类似于已知的Ca-II和磁场强度的关系。每个BP和FP的磁通量密度是根据MHD模型计算从它们的G带亮度估计的。BP和FP的实体覆盖总视场[FOV],其数密度为0.32/Mm^2,总面积贡献为2.0%。它们各自的校准产生的平均通量密度在整个FOV中为20 Mx/cm ^2,在网络间区域为13 Mx/cm ^2。

英文摘要:

We determine the number density and area contribution of small-scale inter-granular calcium-II bright G-band structures in images of the quiet Sun as tracers of kilo-Gauss magnetic flux-concentrations. In a 149" x 117" G-band image of the disk center at the activity minimum, 7593 small inter-granular structures ['IGS']were segmented with the `multiple-level tracking' pattern recognition algorithm ['MLT_4']. The scatter-plot of the continuum versus the G-band brightness shows the known magnetic and non-magnetic branches. These branches are largely disentangled by applying an intrinsic Ca-II excess criterion. The thus obtained 2995 structures contain 1152 G-band bright points ['BP'] and 1843 G-band faint points ['FP']. They show a tendency of increasing size with decreasing G-band excess, as expected from the `hot wall' picture. Their Ca-H and G-band brightness are slightly related, resembling the known relation of Ca-II and magnetic field strength. The magnetic flux density of each individual BP and FP is estimated from their G-band brightness according to MHD-model calculations. The entity of BP and FP covers the total field-of-view ['FOV'] with a number density of 0.32/Mm^2 and a total area contribution of 2.0%. Their individual calibrations yield a mean flux density of 20 Mx/cm^2 in the entire FOV and 13 Mx/cm^2 for inter-network regions.

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