AI 中文总结
该研究以复杂太阳黑子的5个强颗粒状亮桥为对象，通过GREGOR光谱偏振扫描等方法分析其颗粒与磁场的关系，发现磁场强度与颗粒相关参数呈负相关，仅局部磁场近 equipartition值时亮桥才出现大膨胀颗粒。
AI 中文摘要
太阳黑子中的颗粒状亮桥是磁对流的一种表现形式，所处磁场大致垂直，强度比本影磁场弱。我们研究了位于一个复杂太阳黑子中的5个强颗粒状亮桥内，观测到的颗粒性质与磁场之间的关系。通过对GREGOR光谱偏振扫描（使用Si I 1082.71 nm和Ca I 1083.90 nm谱线）进行反演，得到了热参数、磁场矢量和视线速度；在TiO波段的同步图像序列中测量了颗粒的大小和寿命。研究的亮桥包含跨度为0.2角秒至1.4角秒的颗粒，寿命约为6分钟。最大的颗粒结构（大于1角秒）与1 km/s的上涌流以及 equipartition阈值附近的弱倾斜磁场（300 G）在空间上相关。统计比较表明，磁场强度与连续谱强度、视线速度弥散、有效颗粒直径之间呈负相关。这些关系因单个亮桥而异，取决于大尺度磁场拓扑。只有当局部磁场强度接近 equipartition值时，亮桥中才会出现与光球类似的大膨胀颗粒。
英文摘要
Granular light bridges in sunspots are a manifestation of magnetoconvection in an approximately vertical magnetic field that is weaker than the field of the umbra. We study the relations between observed properties of granules and magnetic field in five strong granular light bridges located in a complex sunspot. Thermal parameters, magnetic field vector, and line-of-sight velocity were obtained from an inversion of the GREGOR spectropolarimetric scan in the lines Si I 1082.71 nm and Ca I 1083.90 nm. Sizes and lifetimes of granules were measured in a simultaneous sequence of images in the TiO band. The light bridges under study are comprised of granules spanning 0.2"-1.4" with approximately 6-minute lifetimes. The largest granular structures (> 1") are spatially correlated with 1 km/s upflows and weak, inclined magnetic fields (300 G) near the equipartition threshold. Statistical comparisons demonstrate an inverse relationship between magnetic field strength and continuum intensities, line-of-sight velocity dispersion, and effective granular diameters. These relationships vary among individual light bridges, depending on the large-scale magnetic field topology. Large expanding granules similar to the photospheric ones appear in light bridges only when the local magnetic field strength approaches the equipartition value.
Comments9 pages, 9 figures, and one movie related to Fig. 2. Accepted for publication in Astronomy & Astrophysics
