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arXiv 0804.2695astro-ph
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Hanle和Zeeman联合效应Action引起的Stokes剖面的高级正演和反演

Advanced Forward Modeling and Inversion of Stokes Profiles Resulting from the Joint Action of the Hanle and Zeeman Effects

A. Asensio Ramos, J. Trujillo Bueno, E. Landi Degl'Innocenti

摘要:

未来几年太阳和恒星物理学的一个重大挑战将是破译太阳外层大气(色球层和日冕)的磁性及其与底层光球层磁场的动态耦合。为此,重要的是开发严格的诊断工具,在适当选择的谱线的分光偏振观测的物理解释。本文提出了一个计算机程序,用于合成和反演某些有诊断意义的谱线(如He I 10830 A和D_3多重谱线)中由原子能级偏振和Hanle及Zeeman效应共同作用引起的Stokes轮廓。它基于谱线偏振的量子理论,该理论考虑了所有相关的物理机制和成分(光泵浦、原子级偏振、塞曼、帕申-巴克和汉勒效应)。通过适当的平板模型考虑了辐射转移对出射谱线辐射的影响。用户可以计算出任何给定的磁场矢量的出射强度和极化,或者通过基于全局优化方法的高效反演算法从观察到的斯托克斯分布推断动力学和磁性。这里提出的正演模拟和反演代码的可靠性,证明了通过几个应用程序,其中的范围从推断的磁场矢量在太阳活动区,以确定它是否是冠状在安静的色球区域。这个用户友好的诊断工具称为“HAZEL”(来自HAnle和ZEeman Light),提供给天体物理学界,希望它将促进太阳和恒星物理学的新进展。

英文摘要:

A big challenge in solar and stellar physics in the coming years will be to decipher the magnetism of the solar outer atmosphere (chromosphere and corona) along with its dynamic coupling with the magnetic fields of the underlying photosphere. To this end, it is important to develop rigorous diagnostic tools for the physical interpretation of spectropolarimetric observations in suitably chosen spectral lines. Here we present a computer program for the synthesis and inversion of Stokes profiles caused by the joint action of atomic level polarization and the Hanle and Zeeman effects in some spectral lines of diagnostic interest, such as those of the He I 10830 A and D_3 multiplets. It is based on the quantum theory of spectral line polarization, which takes into account all the relevant physical mechanisms and ingredients (optical pumping, atomic level polarization, Zeeman, Paschen-Back and Hanle effects). The influence of radiative transfer on the emergent spectral line radiation is taken into account through a suitable slab model. The user can either calculate the emergent intensity and polarization for any given magnetic field vector or infer the dynamical and magnetic properties from the observed Stokes profiles via an efficient inversion algorithm based on global optimization methods. The reliability of the forward modeling and inversion code presented here is demonstrated through several applications, which range from the inference of the magnetic field vector in solar active regions to determining whether or not it is canopy-like in quiet chromospheric regions. This user-friendly diagnostic tool called "HAZEL" (from HAnle and ZEeman Light) is offered to the astrophysical community, with the hope that it will facilitate new advances in solar and stellar physics.

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。

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