Characterizing motion types of G-band bright points in the quiet Sun
Characterizing motion types of G-band bright points in the quiet Sun
复制标题
表征安静太阳中 G 波段亮点的运动类型
DOI：
10.1088/1674-4527/15/4/009
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发表时间：
2014-07
影响因子：
1.8
通讯作者：
Wang, Feng
中科院分区：
文献类型：
--
作者：
Feng, Song;Deng, Hui;Lin, Jia-Ben;Wang, Feng
我们研究了G带亮点(Gbps)在安静太阳下的运动，得到了不同运动类型的特征。使用Hinode/Solar光学望远镜(SOT)拍摄的高分辨率图像序列，通过在时空立方体中分割3D演化结构来自动跟踪Gbps。在将在其生命周期内不移动的GBP放在一边之后，基于其运动类型的索引将非静止GBP分类为三种类型。大多数以直线或近直线运动的Gbps被归类为直线运动类型，少数以旋转路径运动为旋转运动，其余的属于我们称为不稳定的运动类型。平均水平速度S−1为2.18±0.0 8公里，S−1为1.6 3±0.0 9公里，S−1为1.3 3±0.0 7公里。我们发现，如果GBP沿直线运动，则它在整个生命周期中以较高的恒定速度漂移。然而，如果它在旋转路径上运动，它的速度就会变得更低。对于直线运动、不规则运动和旋转运动，扩散过程分别为弹道扩散、超扩散和次扩散。相应的扩散指数(γ)和扩散系数(K)分别为2.13±0.0 9和85 0±37 km2 S−1，1.82±0.0 7和331±2 4 km2 S−1，0.73±0.19和13±9 km2 S−1。
We study the motion of G-band bright points (GBPs) in the quiet Sun to obtain the characteristics of different motion types. A high resolution image sequence taken with the Hinode/Solar Optical Telescope (SOT) is used, and GBPs are automatically tracked by segmenting 3D evolutional structures in a space-time cube. After putting the GBPs that do not move during their lifetimes aside, the non-stationary GBPs are categorized into three types based on an index of their motion type. Most GBPs that move in straight or nearly straight lines are categorized as a straight motion type, a few moving in rotary paths into rotary motion, and the others fall into a motion type we called erratic. The mean horizontal velocities are 2.18±0.08 km s−1, 1.63±0.09 km s−1 and 1.33±0.07 km s−1 for straight, erratic and rotary motion types, respectively. We find that a GBP drifts at a higher and constant velocity during its whole life if it moves in a straight line. However, it has a lower and variational velocity if it moves on a rotary path. The diffusive process is ballistic-, super- and sub-diffusion for straight, erratic and rotary motion types, respectively. The corresponding diffusion index (γ) and coefficients (K) are 2.13±0.09 and 850±37 km2 s−1, 1.82±0.07 and 331±24 km2 s−1, and 0.73±0.19 and 13±9 km2 s−1. In terms of direction of motion, it is homogeneous and isotropic, and usually persists between neighboring frames, no matter what motion type a GBP is classified as.
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DOI：
10.1086/306471
发表时间：
1998-02
期刊：
The Astrophysical Journal
影响因子：
--
作者：
A. A. Ballegooijen-A.;P. Nisenson;R. Noyes;Mats G. Lofdahl;R. Stein;Å. Nordlund;V. Krishnakumar
通讯作者：
A. A. Ballegooijen-A.;P. Nisenson;R. Noyes;Mats G. Lofdahl;R. Stein;Å. Nordlund;V. Krishnakumar
影响因子：
1
作者：
Ji, Kai-fan;Deng, Hui;Wang, Feng;Fu, Xiao-dong
通讯作者：
Fu, Xiao-dong
安静的太阳和花丝上的磁非势能
影响因子：
1.8
作者：
赵萌;汪景琇;金春兰
通讯作者：
金春兰
DOI：
10.1088/0004-637x/727/1/17
发表时间：
2011-01
期刊：
The Astrophysical Journal
影响因子：
--
作者：
V. Fedun;S. Shelyag;R. Erdélyi
通讯作者：
V. Fedun;S. Shelyag;R. Erdélyi
影响因子：
6.5
作者：
Balmaceda, L.;Dominguez, S. Vargas;Domingo, V.
通讯作者：
Domingo, V.