Measurements of Photospheric and Chromospheric Magnetic Field Structures Associated with Chromospheric Heating over a Solar Plage Region
Measurements of Photospheric and Chromospheric Magnetic Field Structures Associated with Chromospheric Heating over a Solar Plage Region
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DOI：
10.3847/1538-4357/ac1b9c
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发表时间：
2021-08
期刊：
影响因子：
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通讯作者：
T. Anan;T. Schad;R. Kitai;Gabriel Ionel Dima;S. Jaeggli;L. Tarr;M. Collados;C. Dominguez-Tagle;L. Kleint
中科院分区：
文献类型：
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作者：
T. Anan;T. Schad;R. Kitai;Gabriel Ionel Dima;S. Jaeggli;L. Tarr;M. Collados;C. Dominguez-Tagle;L. Kleint
为了研究黑斑区的磁结构与加热特征的关系，我们利用安装在格雷戈尔望远镜上的格雷戈尔红外光谱仪的积分场单位模，于2018年10月3日观测到了一个具有He-I 1083.0 nm和Si-I 1082.7 nm谱线的黑斑区。在GRIS观测期间，界面区成像光谱仪获得了从同一区域发射的紫外二重态镁II的光谱。在斑块区的外围，在GRIS观察到的有限视场内，我们发现镁离子的辐射通量随色球磁场的增加而增加，其比例系数为2.38×104erg cm−2 S−1 G−1。这种正相关关系表明，磁通管可以通过阿尔芬波湍流或与阿尔芬波有关的离子与中性原子的碰撞来加热。在斑块区域内，光球内强磁场斑块之间或磁斑边缘的辐射通量较大。另一方面，我们没有发现增强的辐射通量与色球磁场强度或电流之间有任何显著的空间相关性。除了与Alfvén波有关的阿尔芬波湍流或离子与中性原子之间的碰撞外，与磁通量管相互作用产生的磁场扰动有关的其他加热机制可能在斑块色球中发挥作用。
In order to investigate the relation between magnetic structures and the signatures of heating in plage regions, we observed a plage region with the He i 1083.0 nm and Si i 1082.7 nm lines on 2018 October 3 using the integral field unit mode of the GREGOR Infrared Spectrograph (GRIS) installed at the GREGOR telescope. During the GRIS observation, the Interface Region Imaging Spectrograph obtained spectra of the ultraviolet Mg ii doublet emitted from the same region. In the periphery of the plage region, within the limited field of view seen by GRIS, we find that the Mg ii radiative flux increases with the magnetic field in the chromosphere with a factor of proportionality of 2.38 × 104 erg cm−2 s−1 G−1. The positive correlation implies that magnetic flux tubes can be heated by Alfvén wave turbulence or by collisions between ions and neutral atoms relating to Alfvén waves. Within the plage region itself, the radiative flux was large between patches of strong magnetic field strength in the photosphere or at the edges of magnetic patches. On the other hand, we do not find any significant spatial correlation between the enhanced radiative flux and the chromospheric magnetic field strength or the electric current. In addition to the Alfvén wave turbulence or collisions between ions and neutral atoms relating to Alfvén waves, other heating mechanisms related to magnetic field perturbations produced by interactions of magnetic flux tubes could be at work in the plage chromosphere.