What is a flux tube? On the magnetic field topology of buoyant flux structures
What is a flux tube? On the magnetic field topology of buoyant flux structures
复制标题
什么是通量管？
DOI：
10.1111/j.1365-2966.2005.09741.x
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发表时间：
2006
影响因子：
4.8
通讯作者：
Kelly S. Cline
中科院分区：
文献类型：
--
作者：
F. Cattaneo;N. Brummell;Kelly S. Cline
我们研究了穿过浮力磁通结构的磁力线的拓扑结构。磁结构，视觉上类似于理想化的磁通量管，产生自洽的磁浮力和本地化的速度剪切的相互作用在一个稳定的分层大气的数值模拟。取决于参数，系统表现出不同程度的对称性。通过沿着磁场线积分并构建返回图，我们表明，根据潜在行为的类型、演化阶段以及对称程度，产生的磁结构可以具有具有三种不同拓扑结构之一的场线。当x-平移和y-反射对称性保持不变时，磁场线位于表面上，但单独的线不覆盖表面。当y对称性被破坏时，磁场线位于表面上，并且单独的线确实覆盖表面。当x和y对称性都被破坏时，磁力线在磁活性区域的大体积上混乱地徘徊。我们将讨论这些结果如何影响我们的简单想法的磁通量管作为一个内部和外部的对象，并介绍了“漏”管的概念。
We study the topology of field lines threading buoyant magnetic flux structures. The magnetic structures, visually resembling idealized magnetic flux tubes, are generated self-consistently by numerical simulation of the interaction of magnetic buoyancy and a localized velocity shear in a stably stratified atmosphere. Depending on the parameters, the system exhibits varying degrees of symmetry. By integrating along magnetic field lines and constructing return maps, we show that, depending on the type of underlying behaviour, the stages of the evolution, and therefore the degree of symmetry, the resulting magnetic structures can have field lines with one of three distinct topologies. When the x-translational and y-reflectional symmetries remain intact, magnetic field lines lie on surfaces but individual lines do not cover the surface. When the y symmetry is broken, magnetic field lines lie on surfaces and individual lines do cover the surface. When both x and y symmetries are broken, magnetic field lines wander chaotically over a large volume of the magnetically active region. We discuss how these results impact our simple ideas of a magnetic flux tube as an object with an inside and an outside, and introduce the concept of ‘leaky’ tubes.