论文标题

基于焓的固定式建模,重建了安静的冠状环路

Enthalpy-based modeling of tomographically reconstructed quiet-Sun coronal loops

论文作者

Mac Cormack, C., Fuentes, M. López, Mandrini, C. H., Lloveras, D. G., Vásquez, A. M.

论文摘要

太阳电晕的结构由磁通管或环制成。由于缺乏与环境的对比,因此在安静的阳光下观察和研究冠状循环非常困难。在这项工作中,我们使用差分排放量表(DEMT)技术来重建,从涵盖整个太阳旋转的一系列EUV图像,这是冠状等离子体的热性能的平均3D分布。通过将DEMT产物与全球冠状磁场的外推相结合,我们重建冠状环,并获得将它们保持在电晕典型的百万度温度下所需的能量输入。我们从统计学上研究了大量用于Carrington旋转的重建环(CR)2082获得一系列不同长度的典型平均环路。我们寻找热属性与构造典型环的长度之间的关系,并找到与先前工作\ citep {macCormack_2020}中发现的结果相似的结果。我们还通过将其与零维(0D)水动力模型基于焓焓的热演化进行比较来分析典型的环路特性。我们探索两个加热方案。在第一个中,假设典型的环在准静态平衡中,我们会应用恒定的加热速率。在第二种情况下,我们使用短冲动事件加热回路中的血浆。我们发现,相对于流体动力学模型的准静态平衡溶液,重建的典型环是过量的。另一方面,冲动加热可以更好地再现观测到的较短和大约半圆形环的观察到的密度和温度。

The structure of the solar corona is made of magnetic flux tubes or loops. Due to the lack of contrast with their environment, observing and studying coronal loops in the quiet Sun is extremely difficult. In this work we use a differential emission measure tomographic (DEMT) technique to reconstruct, from a series of EUV images covering an entire solar rotation, the average 3D distribution of the thermal properties of the coronal plasma. By combining the DEMT products with extrapolations of the global coronal magnetic field, we reconstruct coronal loops and obtain the energy input required to keep them at the typical million-degree temperatures of the corona. We statistically study a large number of reconstructed loops for Carrington rotation (CR) 2082 obtaining a series of typical average loops of different lengths. We look for relations between the thermal properties and the lengths of the constructed typical loops and find similar results to those found in a previous work \citep{maccormack_2020}. We also analyze the typical loop properties by comparing them with the zero-dimensional (0D) hydrodynamic model Enthalpy-Based Thermal Evolution of Loops \citep[EBTEL, ][]{klimchuk_2008}. We explore two heating scenarios. In the first one, we apply a constant heating rate assuming that typical loops are in quasi-static equilibrium. In the second scenario we heat the plasma in the loops using short impulsive events. We find that the reconstructed typical loops are overdense with respect to quasi-static equilibrium solutions of the hydrodynamic model. Impulsive heating, on the other hand, reproduces better the observed densities and temperatures for the shorter and approximately semicircular loops.

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