THE CYCLING OF MATERIAL BETWEEN THE SOLAR CORONA AND CHROMOSPHERE
THE CYCLING OF MATERIAL BETWEEN THE SOLAR CORONA AND CHROMOSPHERE
复制标题
日冕和色球层之间的物质循环
DOI：
10.1088/0004-637x/769/1/47
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
B. Pontieu
中科院分区：
文献类型：
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作者：
Nuno Guerreiro;V. Hansteen;B. Pontieu
对过渡区发射谱线的观测表明，从色球层顶部到2.5 × 105 K的温度时，谱线会发生红移，而在2.5 × 105 K以上的温度时，谱线会发生蓝移。然而，这是值得怀疑的，在较低的过渡区明显的大的向下流动表示的电晕排空，所以一定有某种机制负责维持日冕和低层大气之间的质量平衡。我们使用一个三维磁流体动力学代码来研究日冕，过渡区，色球之间的质量循环，通过添加示踪流体的模拟在过渡区的各种温度间隔。我们发现，在温度低于3 × 105K时形成的过渡区发射线中看到的大多数材料是从色球温度迅速加热的材料，然后随着冷却而被推下。这意味着大部分过渡区材料存在于小的环中。在这些回路中，密度高，辐射冷却有效。
Observations of transition region emission lines reveal the presence of redshifts in lines formed from the top of the chromosphere up to temperatures of about 2.5 × 105 K and blueshifts for temperatures above that. However, it is doubtful that the apparent large downward flows in the lower transition region represents an emptying of the corona, so some mechanism must be responsible for maintaining the mass balance between the corona and the lower atmospheric layers. We use a three-dimensional magnetohydrodynamics code to study the cycling of mass between the corona, transition region, and chromosphere by adding a tracer fluid to the simulation in various temperature intervals in the transition region. We find that most of the material seen in transition region emission lines formed at temperatures below 3 × 105 K is material that has been rapidly heated from chromospheric temperatures and thereafter is pushed down as it cools. This implies that the bulk of transition region material resides in small loops. In these loops, the density is high and radiative cooling is efficient.