Localized Amplification of Magnetic Field in the Solar Photosphere Associated with a Rapid Moving Pore
Localized Amplification of Magnetic Field in the Solar Photosphere Associated with a Rapid Moving Pore
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与快速移动孔隙相关的太阳光球层磁场的局域放大
DOI：
10.3847/2041-8213/abb096
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Yang Jiayan
中科院分区：
文献类型：
--
作者：
Xu Zhe;Ji Haisheng;Ji Kaifan;Bi Yi;Yang Bo;Hong Junchao;Yang Jiayan
在太阳中，热等离子体流驱动发电机，产生全球磁场以及较小规模的局部场。磁场的存在反过来影响等离子体的运动，从而可以观察到复杂的动力学特性。本文分析了运动孔隙前磁场的局域放大现象。随着孔隙的移动，可以同时观察到半圆半影状结构的形成和水平场的增强。在半影状区域中的水平磁场的增加可能不是来自孔隙，因为半影状结构不连接到孔隙和磁隙的存在。也可以安全地排除通量出现的可能性。我们进一步报告说，水平磁场在前面的一个移动的孔隙放大根据MHD感应方程后，必要的，但合理的简化。所有这些特征表明，由运动孔隙驱动的流动可以导致其前端附近的磁场放大。这些观测来自太阳动力学观测站上的日震和磁成像仪。
In the Sun, the flows of hot plasma drive a dynamo that generates a global magnetic field as well as smaller-scale local fields. The existence of a magnetic field in turn affects the motion of plasma so that complex dynamic characteristics can be observed. In this Letter, we give an analysis on the localized amplification of magnetic fields in front of a moving pore. Moving with the pore, the formation of semicircular penumbra-like structures and enhancement of horizontal fields can be observed simultaneously. The increasing horizontal magnetic fields in a penumbra-like area probably did not come from the pore, since the penumbra-like structures were not connected to the pore and a magnetic gap existed. The possibility of flux emergence can also be safely excluded. We further report that horizontal magnetic fields in the front of a moving pore are amplified in accordance with the MHD induction equation after necessary yet reasonable simplification. All characteristics show that the flows driven by the moving pore can lead to the amplification of the magnetic fields around its front. The observations are from the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory.