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Abnormal Stokes V profiles observed by Hinode in a sunspot
Astronomy & Astrophysics ( IF 5.4 ) Pub Date : 2024-11-19 , DOI: 10.1051/0004-6361/202450625
H. Hamedivafa, R. Rezaei

Context. Hidden magnetic components in a sunspot are present as small-scale structures that are absent in low-resolution observations.Aims. We search for traces of the hidden magnetic components in spectro-polarimetric observations of a mature sunspot close to the disk center recorded by Hinode.Methods. To find extra humps in the far blue and red lobes of Stokes V, we examined the sign reversal in the second derivative of the profile in the umbra and penumbra. We also looked for the hump signature in the Stokes I and the linear polarization profiles.Results. The amplitudes of the humps are small compared to the main component. More than half of the profiles show one extra hump, while 21% show an extra hump on both the blue and the red lobe of the 630.15 nm line with the same magnetic polarity as the sunspot. The location of the pixels where the extra hump is seen on both lobes has a pseudo-grainy structure in the single wavelength Stokes V magnetograms. This type of profile is better detected in darker parts of the penumbra, as well as in the umbra-penumbra border toward the umbra. The spectral distance between the two humps averaged over elliptical rings levels off in the umbra, decreases toward the penumbra, and levels off again there. We find no correlations between the wavelength positions of the two humps.Conclusions. We discuss two scenarios that could potentially produce the simultaneously observed blue and red humps: one in which a single hidden magnetic component is responsible for the two humps, and another in which the two humps emanate from two hidden magnetic components.

中文翻译:


Hinode 在太阳黑子中观察到的异常斯托克斯 V 剖面



上下文。太阳黑子中隐藏的磁性成分以小尺度结构的形式存在,这在低分辨率观测中是不存在的。目标。我们在 Hinode.Methods 记录的靠近盘中心的成熟太阳黑子的光谱极化观测中寻找隐藏磁性成分的痕迹。为了在 Stokes V 的远蓝色和红色裂片中找到额外的驼峰,我们检查了本影和半影中轮廓的二阶导数中的符号反转。我们还在 Stokes I 和线性极化剖面中寻找驼峰特征。结果。与主要成分相比,驼峰的振幅很小。超过一半的剖面图显示一个额外的驼峰,而 21% 的剖面图在 630.15 nm 线的蓝色和红色波瓣上都显示一个额外的驼峰,其磁极与太阳黑子相同。在两个波瓣上看到额外驼峰的像素位置在单波长斯托克斯 V 磁图中具有伪颗粒状结构。这种类型的轮廓在半影较暗的部分以及朝向本影的本影-半影边界中可以更好地检测到。在椭圆环上平均的两个驼峰之间的光谱距离在本影中趋于平稳,向半影处减小,然后在那里再次趋于平稳。我们发现两个驼峰的波长位置之间没有相关性。结论。我们讨论了两种可能产生同时观察到的蓝色和红色驼峰的情况:一种是单个隐藏的磁性元件负责两个驼峰,另一种是两个隐藏的磁性元件发出两个凸起。
更新日期:2024-11-20