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arXiv 1105.3092astro-ph.SR
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宁静太阳区小尺度对流涡状运动的空间分布和统计特性

Spatial distribution and statistical properties of small-scale convective vortex-like motions in a quiet Sun region

S. Vargas Dominguez, J. Palacios, L. Balmaceda, I. Cabello, V. Domingo

摘要:

本文分析了位于拉帕尔马的瑞典1米太阳望远镜对宁静的太阳网间区域的高分辨率观测。我们通过计算时间序列图像上小尺度结构的水平自行来确定太阳光球区小尺度涡旋运动的位置。这些等离子体对流驱动的漩涡运动与以下两个方面有关:(1)下降气流(通常解释为对应于等离子体冷却并因此返回到可见光球层以下的内部的位置),以及(2)水平速度矢量收敛到中心点。下沉核被证明是被动浮子追踪等离子体流向每个漩涡中心的最终目的地。对于这里分析的两个时间序列,我们确定这些事件的发生分别为1.4 x 10^(-3)和1.6 x 10^(-3)涡旋Mm^(-2)min^(-1)。

英文摘要:

High-resolution observations of a quiet Sun internetwork region taken with the Solar 1-m Swedish Telescope in La Palma are analyzed. We determine the location of small-scale vortex motions in the solar photospheric region by computing the horizontal proper motions of small-scale structures on time series of images. These plasma convectively-driven swirl motions are associated to: (1) downdrafts (that have been commonly explained as corresponding to sites where the plasma is cooled down and hence returned to the interior below the visible photospheric level), and (2) horizontal velocity vectors converging into a central point. The sink cores are proved to be the final destination of passive floats tracing plasma flows towards the center of each vortex. We establish the occurrence of these events to be 1.4 x 10^(-3) and 1.6 x 10^(-3) vortices Mm^(-2) min^(-1) respectively for two time series analyzed here.

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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