Traditionally, the strongest magnetic fields on the Sun have been measured in sunspot umbrae. More recently, however, much stronger fields have been measured at the ends of penumbral filaments carrying the Evershed and counter-Evershed flows. Superstrong fields have also been reported within a light bridge separating two umbrae of opposite polarities. We aim to accurately determine the strengths of the strongest fields in a light bridge using an advanced inversion technique and to investigate their detailed structure. We analyze observations from the spectropolarimeter on board the Hinode spacecraft of the active region AR 11967. The thermodynamic and magnetic configurations are obtained by inverting the Stokes profiles using an inversion scheme that allows multiple height nodes. Both the traditional 1D inversion technique and the so-called 2D coupled inversions, which take into account the point spread function of the Hinode telescope, are used. We find a compact structure with an area of 32.7 arcsec$^2$ within a bipolar light bridge with field strengths exceeding 5 kG, confirming the strong fields in this light bridge reported in the literature. Two regions associated with downflows of $\sim$5 km s$^{-1}$ harbor field strengths larger than 6.5 kG, covering a total area of 2.97 arcsec$^2$. The maximum field strength found is 8.2 kG, which is the largest ever observed field in a bipolar light bridge up to now.

中文翻译：

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太阳黑子光桥最强磁场的检测

传统上，太阳上最强的磁场是在太阳黑子本影中测量的。然而，最近，在携带 Evershed 和反 Evershed 流的半影细丝末端测量到了更强的场。据报道，在分隔两个相反极性的本影的光桥内也存在超强场。我们的目标是使用先进的反演技术准确确定光桥中最强场的强度并研究它们的详细结构。我们分析了来自活跃区域 AR 11967 的 Hinode 航天器上的分光偏振计的观察结果。通过使用允许多个高度节点的反演方案反演斯托克斯轮廓来获得热力学和磁性配置。既使用了传统的一维反演技术，也使用了考虑到日之出望远镜点扩散函数的所谓二维耦合反演。我们在场强超过 5 kG 的双极光桥内发现了面积为 32.7 arcsec$^2$ 的紧凑结构，证实了文献中报道的该光桥中的强场。与 $\sim$5 km s$^{-1}$ 下降流相关的两个区域的港口场强大于 6.5 kG，总面积为 2.97 arcsec$^2$。发现的最大场强为 8.2 kG，这是迄今为止在双极光桥中观察到的最大场强。7 arcsec$^2$ 在场强超过 5 kG 的双极光桥内，证实了文献中报道的该光桥中的强场。与 $\sim$5 km s$^{-1}$ 下降流相关的两个区域的港口场强大于 6.5 kG，总面积为 2.97 arcsec$^2$。发现的最大场强为 8.2 kG，这是迄今为止在双极光桥中观察到的最大场强。7 arcsec$^2$ 在场强超过 5 kG 的双极光桥内，证实了文献中报道的该光桥中的强场。与 $\sim$5 km s$^{-1}$ 下降流相关的两个区域的港口场强大于 6.5 kG，总面积为 2.97 arcsec$^2$。发现的最大场强为 8.2 kG，这是迄今为止在双极光桥中观察到的最大场强。