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arXiv 2108.07907astro-ph.SR
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与色球加热有关的太阳黑子区光球和色球磁场结构的测量

Measurements of Photospheric and Chromospheric Magnetic Field Structures Associated with Chromospheric Heating over a Solar Plage Region

Tetsu Anan, Thomas A. Schad, Reizaburo Kitai, Gabriel I. Dima, Sarah A. Jaeggli, Lucas A. Tarr, Manuel Collados, Carlos Dominguez-Tagle, Lucia Kleint

摘要:

为了研究磁结构与斑区加热特征之间的关系,我们在2018年10月3日使用安装在GREGOR望远镜上的GREGOR红外光谱仪(GRIS)的积分场单元模式观测了具有He I 1083.0 nm和Si I 1082.7 nm谱线的斑区。在GRIS观测过程中,界面区成像光谱仪(IRIS)获得了从同一区域发射的紫外Mg II双峰的光谱。在GRIS观测到的有限视场范围内,在谱斑区域的外围,我们发现Mg II辐射通量随着色球层中的磁场的增加而增加,比例因子为2.38 \times 10^4 erg cm^{-2} s^{-1} G^{-1}。这种正相关关系表明,磁通量管可以被阿尔夫文波湍流加热,也可以被离子与中性原子碰撞加热。在谱斑区域内,光球层中的强磁场强度斑块之间或磁斑块边缘的辐射通量很大。另一方面,我们没有发现任何显着的空间相关性之间的增强辐射通量和色球磁场强度或电流。在色球层中,除了与阿尔芬波有关的阿尔芬波湍流或离子与中性原子的碰撞外,还可能存在其他与磁通量管相互作用产生的磁场扰动有关的加热机制。

英文摘要:

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 (IRIS) 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 \times 10^4 erg cm^{-2} s^{-1} G^{-1}. The positive correlation implies that magnetic flux tubes can be heated by Alfv'en wave turbulence or by collisions between ions and neutral atoms relating to Alfv'en 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 Alfv'en wave turbulence or collisions between ions and neutral atoms relating to Alfv'en waves, other heating mechanisms related to magnetic field perturbations produced by interactions of magnetic flux tubes could be at work in the plage chromosphere.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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