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arXiv 1012.4481astro-ph.SR
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介观颗粒与太阳表面磁场分布

Mesogranulation and the solar surface magnetic field distribution

L. Yelles Chaouche, F. Moreno-Insertis, V. Martínez Pillet, T. Wiegelmann, J. A. Bonet, M. Knölker, L. R. Bellot Rubio, J. C. del Toro Iniesta, P. Barthol, A. G… 展开作者

L. Yelles Chaouche, F. Moreno-Insertis, V. Martínez Pillet, T. Wiegelmann, J. A. Bonet, M. Knölker, L. R. Bellot Rubio, J. C. del Toro Iniesta, P. Barthol, A. Gandorfer, W. Schmidt, S. K. Solanki

摘要:

利用由日出上的IMaX仪器获得的高空间(~ 100公里)和时间(~ 30秒)分辨率数据,研究了太阳表面磁场与中颗粒细胞的关系。首先,利用拉格朗日示踪剂(软木塞)通过局部相关跟踪获得的水平速度场的基础上确定mesogranular细胞。经过约20分钟的整合,示踪剂描绘了一个尖锐的中粒网络与车道的宽度低于约280公里。定量地测试了磁性元素在中颗粒细胞中的优先位置。磁场高于100 G的像素中大约85%位于中颗粒通道附近。因此,磁通量集中在颗粒间通道而不是颗粒间通道。其次,进行磁场外推以获得锚定在所观测的通量元素中的磁力线。因此,这种分析与第一部分中确定的水平流无关。概率密度函数(PDF)计算的分布之间的距离分布的各个磁场线的足迹。PDF在1和10 Mm之间的尺度上具有指数形状,具有恒定的特征衰减距离,表明在中颗粒范围内没有优选的对流尺度。我们的研究结果支持的观点,中粒化是不是一个内在的对流尺度(在这个意义上,它不是一个主要的能量注入尺度的太阳对流),但也给出了定量的确认,尽管如此,磁性元素优先发现沿中粒通道。

英文摘要:

The relation of the solar surface magnetic field with mesogranular cells is studied using high spatial (~ 100 km) and temporal (~ 30 sec) resolution data obtained with the IMaX instrument aboard SUNRISE. First, mesogranular cells are identified using Lagrange tracers (corks) based on horizontal velocity fields obtained through Local Correlation Tracking. After ~ 20 min of integration, the tracers delineate a sharp mesogranular network with lanes of width below about 280 km. The preferential location of magnetic elements in mesogranular cells is tested quantitatively. Roughly 85% of pixels with magnetic field higher than 100 G are located in the near neighborhood of mesogranular lanes. Magnetic flux is therefore concentrated in mesogranular lanes rather than intergranular ones. Secondly, magnetic field extrapolations are performed to obtain field lines anchored in the observed flux elements. This analysis, therefore, is independent of the horizontal flows determined in the first part. A probability density function (PDF) is calculated for the distribution of distances between the footpoints of individual magnetic field lines. The PDF has an exponential shape at scales between 1 and 10 Mm, with a constant characteristic decay distance, indicating the absence of preferred convection scales in the mesogranular range. Our results support the view that mesogranulation is not an intrinsic convective scale (in the sense that it is not a primary energy-injection scale of solar convection), but also give quantitative confirmation that, nevertheless, the magnetic elements are preferentially found along mesogranular lanes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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