Kinematic Modeling of Vortices in the Solar Photosphere
Kinematic Modeling of Vortices in the Solar Photosphere
复制标题
太阳光球层涡旋的运动学建模
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
N. Weiss
中科院分区：
文献类型：
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作者：
G. Simon;N. Weiss
将局部相关跟踪应用于颗粒的固有运动，得到太阳表面的水平速度场。速度的散度揭示了源和汇的模式。涡度集中在下沉处形成局部漩涡（有两种运动感）。这种涡旋的一个简单的运动学模型，其中径向流入由涡流粘度平衡，预测涡旋度应该具有高斯分布。这一预测通过与三组高分辨率观测数据的比较得到了证实，这三组观测数据分别来自太空实验室2号和拉帕尔马的瑞典真空太阳望远镜。最后，我们开发了一个更精确的模型版本，并提供了由于小规模造粒而产生的涡流粘度的估计。
The application of local correlation tracking to the proper motions of granules yields the horizontal velocity field at the solar surface. The divergence of the velocity reveals a pattern of sources and sinks. The vorticity is concentrated at sinks to form local swirls (with either sense of motion). A simple kinematic model of such a vortex, in which the radial inflow is balanced by an eddy viscosity, predicts that the vorticity should have a Gaussian profile. This prediction is confirmed by comparison with three sets of high-resolution observations, obtained from Spacelab 2 and from the Swedish Vacuum Solar Telescope on La Palma. Finally, we develop a more precise version of the model and provide an estimate of the eddy viscosity due to small-scale granulation.