arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1202.0593astro-ph.SR
收藏

宁静太阳中单瓣圆偏振剖面的研究

Study of single-lobed circular polarization profiles in the quiet Sun

A. Sainz Dalda, J. Martinez-Sykora, L. Bellot Rubio, A. Title

摘要:

自20世纪70年代以来,人们就知道太阳光球层中出现的圆偏振(斯托克斯V)分布存在不对称性。这些分布要求沿视线存在速度梯度,可能与磁场强度、倾角和/或方位角的梯度相关联。我们的研究集中在斯托克斯V型剖面上,该剖面仅在一个波瓣上显示出极端的不对称性。使用日出分光偏振测量,我们已经进行了统计研究,这些配置文件中的安静的太阳的属性。我们展示了它们的空间分布,它们的主要物理性质,它们与几个物理观测值的关系,以及它们在太阳盘面上的位置。单叶斯托克斯V型剖面约占太阳表面的2%。这是第一次,我们已经观察到他们的时间演变,并已检索的物理条件的大气,他们出现了使用逆代码实现沿视线的大气参数的不连续性。此外,我们使用来自3D磁对流模拟的合成斯托克斯剖面来补充反演结果。合成的单瓣剖面的主要特征与观测的基本一致,支持反演推断的磁性和动力学拓扑结构。结合所有这些不同的分析表明,大多数的单叶斯托克斯V型配置文件的信号来自磁通量出现和/或淹没过程发生在小补丁的光球安静的太阳。

英文摘要:

The existence of asymmetries in the circular polarization (Stokes V) profiles emerging from the solar photosphere is known since the 1970s. These profiles require the presence of a velocity gradient along the line of sight, possibly associated with gradients of magnetic field strength, inclination and/or azimuth. We have focused our study on the Stokes V profiles showing extreme asymmetry in the from of only one lobe. Using Hinode spectropolarimetric measurements we have performed a statistical study of the properties of these profiles in the quiet sun. We show their spatial distribution, their main physical properties, how they are related with several physical observables and their behavior with respect to their position on the solar disk. The single lobed Stokes V profiles occupy roughly 2% of the solar surface. For the first time, we have observed their temporal evolution and have retrieved the physical conditions of the atmospheres from which they emerged using an inversion code implementing discontinuities of the atmospheric parameters along the line of sight. In addition, we use synthetic Stokes profiles from 3D magnetoconvection simulations to complement the results of the inversion. The main features of the synthetic single-lobed profiles are in general agreement with the observed ones, lending support to the magnetic and dynamic topologies inferred from the inversion. The combination of all these different analysis suggests that most of the single-lobed Stokes V profiles are signals coming from magnetic flux emergence and/or submergence processes taking place in small patches in the photospheric of the quiet sun.

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。

↑