arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1904.09593astro-ph.SR
收藏

活动区灯丝的偏振光谱分析。I.单分量反演的磁性和动力学性质

Spectropolarimetric analysis of an active region filament. I. Magnetic and dynamical properties from single component inversions

C. J. Díaz Baso, M. J. Martínez González, A. Asensio Ramos

摘要:

通过解释合适的色球谱线中的汉勒效应和塞曼效应,如He I在10830 A处的多重态,可以确定太阳暗条中的磁场矢量。研究了活动区暗条(NOAA 12087)的矢量磁场.该活动区的光谱偏振数据是用GRIS仪器在GREGOR望远镜上获得的,并同时在色球层中与He I 10830 A多重峰和光球层中与Si I 10827 A线进行了研究。与以往的研究一样,本文仅采用单组分模型来推断磁丝的磁性质。这些结果在太阳动态观测图像的帮助下被放入太阳背景中。一些结果清楚地指出,必须进行更复杂的反演。首先,He I的斯托克斯$V$图没有显示出任何明显的暗条存在的特征。其次,局部方位角图遵循与斯托克斯$V$相同的模式,就好像斯托克斯$V$的极性即使在具有相似的线性极化信号的情况下也将推断调节到非常不同的磁场。该指示表明,斯托克斯$V$可以由来自有源区的下方磁场主导,而不是来自灯丝本身。这些和更多的证据将深入分析,并将在本系列的第二部分尝试更复杂的反演。

英文摘要:

The determination of the magnetic filed vector in solar filaments is possible by interpreting the Hanle and Zeeman effects in suitable chromospheric spectral lines like those of the He I multiplet at 10830 A. We study the vector magnetic field of an active region filament (NOAA 12087). Spectropolarimetric data of this active region was acquired with the GRIS instrument at the GREGOR telescope and studied simultaneously in the chromosphere with the He I 10830 A multiplet and in the photosphere with the Si I 10827 A line. As it is usual from previous studies, only a single component model is used to infer the magnetic properties of the filament. The results are put into a solar context with the help of the Solar Dynamic Observatory images. Some results clearly point out that a more complex inversion had to be done. Firstly, the Stokes $V$ map of He I does not show any clear signature of the presence of the filament. Secondly, the local azimuth map follows the same pattern than Stokes $V$ as if the polarity of Stokes $V$ were conditioning the inference to very different magnetic field even with similar linear polarization signals. This indication suggests that the Stokes $V$ could be dominated by the below magnetic field coming from the active region, and not, from the filament itself. Those and more evidences will be analyzed in depth and a more complex inversion will be attempted in the second part of this series.

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。

↑