The Physics and Diagnostic Potential of Ultraviolet Spectropolarimetry
The Physics and Diagnostic Potential of Ultraviolet Spectropolarimetry
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紫外分光光度法的物理和诊断潜力
DOI：
10.1007/s11214-016-0306-8
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发表时间：
2017
影响因子：
10.3
通讯作者：
L. Belluzzi
中科院分区：
文献类型：
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作者：
J. Trujillo Bueno;E. Landi Degl’Innocenti;L. Belluzzi
太阳外层大气磁场的实验研究是天体物理学中一个非常重要的挑战。为此，我们需要识别，测量和解释可观测到的对上色球层，过渡区和日冕的磁性敏感的量。本文概述了分光偏振法在太阳紫外光谱中允许的谱线（如2800 nm附近的MgIands线、1216 nm处的氢莱曼谱线和Heiiat 304 nm处的莱曼谱线）的物理和诊断潜力。太阳外层大气是一种光学泵浦的蒸汽，这种光谱线的线性偏振主要由各向异性辐射的吸收和散射产生的原子级偏振决定。在不均匀和动态的太阳大气中，由于Hanle和Zeeman效应的作用，它的变化需要仔细理解，因为它编码了磁场信息。在某些紫外线中由塞曼效应引起的圆偏振（例如，M100也具有诊断意义，特别是用于探测太阳外大气层中的谱斑和更活跃的区域。少数（开拓性）的观测尝试进行了迄今为止，以测量紫外光谱线偏振产生的光泵原子在色球上层，过渡区和日冕进行了讨论。我们强调，紫外分光偏振测量法是通往太阳和其他恒星外层大气的关键门户。
The empirical investigation of the magnetic field in the outer solar atmosphere is a very important challenge in astrophysics. To this end, we need to identify, measure and interpret observable quantities sensitive to the magnetism of the upper chromosphere, transition region and corona. This paper provides an overview of the physics and diagnostic potential of spectropolarimetry in permitted spectral lines of the ultraviolet solar spectrum, such as the Mgiiandlines around 2800 Å, the hydrogen Lyman-line at 1216 Å, and the Lyman-line of Heiiat 304 Å. The outer solar atmosphere is an optically pumped vapor and the linear polarization of such spectral lines is dominated by the atomic level polarization produced by the absorption and scattering of anisotropic radiation. Its modification by the action of the Hanle and Zeeman effects in the inhomogeneous and dynamic solar atmosphere needs to be carefully understood because it encodes the magnetic field information. The circular polarization induced by the Zeeman effect in some ultraviolet lines (e.g., Mgii&) is also of diagnostic interest, especially for probing the outer solar atmosphere in plages and more active regions. The few (pioneering) observational attempts carried out so far to measure the ultraviolet spectral line polarization produced by optically pumped atoms in the upper chromosphere, transition region and corona are also discussed. We emphasize that ultraviolet spectropolarimetry is a key gateway to the outer atmosphere of the Sun and of other stars.
DOI：
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发表时间：
2006
期刊：
Proc. The 3rd Japan-Korea Seminar on Advanced Diagnostics for Steady-State Fusion Plasma, Matsushima, Japan, 31 August-3 September, 2006 Supplement
影响因子：
--
作者：
H.Yoneda;H.Morikami;K.Ueda;R.M.More;Y.Kawano
通讯作者：
Y.Kawano