533.03 nm处 Cr I 磁场诱导跃迁圆偏振的观测与建模
Observation and Modeling of the circular polarization of the Cr I magnetic field induced transition at 533.03 nm
AI总结：
结合太阳黑子光谱偏振观测、辐射转移建模与大气反演，验证533.03 nm处 Cr I 弱圆偏振信号来自磁场诱导跃迁。
摘要：
我们研究了 Cr I 在533.03 nm（空气中波长）处、发生于 $3d^5(^6S)4d\\ ^7D_2$ 与 $3d^5(^6S)4p\\ ^7P_4^\circ$ 态之间的磁场诱导跃迁（MIT）的圆偏振。在一个渗透着3 kG均匀磁场的太阳黑子模型中，通过求解辐射转移问题得到的该谱线圆偏振度 $V/I$ 显示出约 $2\\%$ 的振幅。我们使用瑞士洛迦诺的 Istituto ricerche solari Aldo e Cele Daccò（IRSOL）天文台的 Zurich Imaging Polarimeter-3，对两个太阳黑子进行了光谱偏振观测。观测到的 $V/I$ 轮廓呈现近似反对称形状，两个太阳黑子的振幅分别约为 $0.1\\%$ 和 $0.2\\%$。该轮廓的中心与上述 MIT 预测的波长相一致。我们将反演代码应用于532.91和532.98 nm处 Cr I 允许线以及533.03 nm处 MIT 线的光谱偏振数据，以推断发射大气的分层结构。我们将在推断出的大气模型中合成的 $V/I$ 轮廓与观测结果进行比较，表明观测信号很可能对应于该 MIT 线。
英文摘要：
We study the circular polarization of the magnetic field induced transition (MIT) between the $3d^5(^6S)4d\ ^7D_2$ and $3d^5(^6S)4p\ ^7P_4^\circ$ states of \ion{Cr}{1} at 533.03~nm (wavelength in air). The fractional circular polarization $V/I$ of this spectral line resulting from the solution of the radiation transfer problem in a sunspot model permeated by a homogeneous magnetic field of 3~kG shows amplitudes of about $2\%$. Spectro-polarimetric observations of two sunspots were obtained with the Zurich Imaging Polarimeter-3 at the Istituto ricerche solari Aldo e Cele Daccò (IRSOL) observatory observatory in Locarno, Switzerland. The observed $V/I$ profiles show approximately anti-symmetrical shapes with an amplitude of around $0.1\%$ and $0.2\%$ for the two sunspots. The center of this profile coincides with the wavelengths predicted for the above-mentioned MIT. We apply an inversion code to the spectro-polarimetric data of the \ion{Cr}{1} permitted lines at 532.91 and 532.98~nm, as well as to the MIT line at 533.03~nm, to infer a stratification of the emitting atmosphere. We compare the $V/I$ profiles synthesized in the inferred atmosphere models with the observations, showing that the observed signal likely corresponds to the MIT line.
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。
