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arXiv 2006.01809astro-ph.SR
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太阳针状体中无处不在的百高斯磁场

Ubiquitous hundred-Gauss magnetic fields in solar spicules

M. Kriginsky, R. Oliver, N. Freij, D. Kuridze, A. Asensio Ramos, P. Antolin

摘要:

目的。利用SST对Ca ii 8542 A谱线的高分辨率偏振光谱观测,研究了太阳针状体中的磁场。方法.将弱场近似(WFA)应用于辐射转移方程,得到的方程用于推导磁场(BLOS)的LOS分量。两个限制性条件施加在斯托克斯I和V配置文件在每个像素之前,它们可以用于贝叶斯反演计算其BLOS。结果LOS磁场分量已被推断在六个数据集共计448光谱扫描的Ca ii 8542 A线,并包含活跃区和安静的太阳区域,与数百G的值被大量推断。从统计学的观点来看,在平静的太阳和活跃区域附近的针状体的磁场强度之间似乎没有差别。另一方面,BLOS分布在盘上的值比离边的值小,这一事实可以用盘上结构的色球层叠加效应来解释。我们发现,在太阳黑子附近的针状体有一个磁场极性(即北或南)等于太阳黑子。本文还分析了离边重叠结构对观测到的Stokes I和V参数以及由WFA得到的BLOS的影响。发现该值等于或小于两种结构的最大LOS磁场分量。此外,使用随机BLOS,多普勒速度和线强度的这两种结构导致在~50%的情况下,斯托克斯I和V参数不适合与WFA一起使用。结论.我们的研究结果提出了一个不足的LOS磁场分量小于约50 G,这不能被视为证据反对这些磁场强度的存在,在针状。

英文摘要:

Aims. We use high-resolution spectropolarimetric observations in the Ca ii 8542 A line obtained with the SST to study the magnetic field in solar spicules. Methods. The equations that result from the application of the Weak Field Approximation (WFA) to the radiative transfer equations are used to infer the LOS component of the magnetic field (BLOS). Two restrictive conditions are imposed on the Stokes I and V profiles at each pixel before they can be used in a Bayesian inversion to compute its BLOS. Results. The LOS magnetic field component has been inferred in six data sets totalling 448 spectral scans in the Ca ii 8542 A line and containing both active region and quiet Sun areas, with values of hundreds of G being abundantly inferred. There seems to be no difference, from the statistical point of view, between the magnetic field strength of spicules in the quiet Sun or near an active region. On the other hand, the BLOS distributions present smaller values on the disk than off-limb, a fact that can be explained by the effect of superposition on the chromosphere of on-disk structures. We find that spicules in the vicinity of a sunspot have a magnetic field polarity (i.e. north or south) equal to that of the sunspot. This paper also contains an analysis of the effect of off-limb overlapping structures on the observed Stokes I and V parameters and the BLOS obtained from the WFA. It is found that this value is equal to or smaller than the largest LOS magnetic field components of the two structures. In addition, using random BLOS, Doppler velocities and line intensities of these two structures leads in ~ 50% of the cases to Stokes I and V parameters unsuitable to be used with the WFA. Conclusions. Our results present a scarcity of LOS magnetic field components smaller than some 50 G, which must not be taken as evidence against the existence of these magnetic field strengths in spicules.

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