On the minimum temperature of the quiet solar chromosphere
On the minimum temperature of the quiet solar chromosphere
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关于安静的太阳色球层的最低温度
DOI：
10.1051/0004-6361/201016392
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发表时间：
2011
影响因子：
6.5
通讯作者：
B. Gudiksen
中科院分区：
文献类型：
--
作者：
J. Leenaarts;M. Carlsson;V. Hansteen;B. Gudiksen
目标。我们的目标是提供一个安静的太阳色球层的最低温度的估计。方法.我们进行了一个二维辐射MHD模拟跨越上层对流区的较低的日冕。模拟包括非LTE辐射传输和状态方程，其中包括非平衡电离的氢和非平衡H2分子形成。我们分析了在我们的模型中所作的各种假设的可靠性，以评估模拟的真实性。结果我们的模拟包含从1毫米到3.2毫米高度的冷气体袋，温度低至1660 K。它高估了辐射加热，包含了1660 K以下的非物理加热。因此，我们得出结论，在安静的太阳色球层中的冷口袋可能有比模拟中更低的温度，只要色球层中存在没有显着磁加热的区域。我们建议离臂分子光谱寻找这样的凉爽的口袋和3D模拟，包括本地发电机和磁地毯调查焦耳加热在安静的色球层。
Aims. We aim to provide an estimate of the minimum temperature of the quiet solar chromosphere. Methods. We perform a 2D radiation-MHD simulation spanning the upper convection zone to the lower corona. The simulation includes non-LTE radiative transfer and an equation-of-state that includes non-equilibrium ionization of hydrogen and non-equilibrium H2 molecule formation. We analyze the reliability of the various assumptions made in our model in order to assess the realism of the simulation. Results. Our simulation contains pockets of cool gas with down to 1660 K from 1 Mm up to 3.2 Mm height. It overestimates the radiative heating, and contains non-physical heating below 1660 K. Therefore we conclude that cool pockets in the quiet solar chromosphere might have even lower temperatures than in the simulation, provided that there exist areas in the chromosphere without significant magnetic heating. We suggest off-limb molecular spectroscopy to look for such cool pockets and 3D simulations including a local dynamo and a magnetic carpet to investigate Joule heating in the quiet chromosphere.