Atomic Polarization and the Hanle Effect
Atomic Polarization and the Hanle Effect
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原子极化和汉勒效应
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
J. T. Bueno
中科院分区：
文献类型：
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作者：
J. T. Bueno
本文介绍了弱磁化恒星大气中的光抽运、原子极化和汉勒效应。虽然这里描述的物理过程和理论框架是感兴趣的应用程序在各种天体物理环境（如散射偏振在拱星信封和偏振天文脉泽），文章主要集中在寻求了解的物理起源的线性偏振太阳临边光谱。它还认为汉勒效应的发展是一种可靠的诊断工具，可以在太阳光球和色球磁性方面取得可行的新进展。特别强调的是一个严格的偏振现象建模理论和观测之间的重要联系。在仔细解释了各种辐射泵浦机制如何在弱磁场存在和不存在的情况下导致原子极化之后，介绍了该领域的一些最新进展。
This article presents an introduction to optical pumping, atomic polarization and the Hanle effect in weakly magnetized stellar atmospheres. Although the physical processes and the theoretical framework described here are of interest for applications in a variety of astrophysical contexts (e.g. scattering polarization in circumstellar envelopes and polarization in astronomical masers), the article focuses mainly on the quest for understanding the physical origin of the linearly polarized solar limb spectrum. It considers also the development of the Hanle effect as a reliable diagnostic tool for making feasible new advances in solar photospheric and chromospheric magnetism. Particular emphasis is given to a rigorous modeling of polarization phenomena as the essential link between theory and observations. Some of the most recent advances in this field are presented after carefully explaining how the various radiation pumping mechanisms lead to atomic polarization in the absence and in the presence of weak magnetic fields.