静止日冕雨的中性氦三重态光谱及光谱偏振磁场诊断的灵敏度估计
Neutral Helium Triplet Spectroscopy of Quiescent Coronal Rain with Sensitivity Estimates for Spectropolarimetric Magnetic Field Diagnostics
摘要：
由于其极化性和磁场敏感性，以及中性氦在部分电离太阳环境中的作用，中性氦三重态（orthohelium）系统提供了重要的，但未充分利用，诊断太阳日冕雨。这项工作描述了在NOAA活动区12468冠状雨的离边观测，在他我10830 $Å$三重获得使用大规模MultipleXed成像光谱仪实验在邓恩太阳望远镜以及从美国宇航局的太阳动力学观测和界面区域成像光谱仪的同时观测。我们在IRIS 1400 $Å$和2796 $Å$通道以及He I 10830 $Å$中同时探测雨。所有通道之间存在的空间相干性与以前观测到的日冕雨的多热性质一致。通过自动探测确定的He I谱廓线的统计分析表明，He I谱线辐射平均为$10^{4}$ ergs cm $^{-2}$ s $^{-1}$ sr $^{-1}$ ;平均平移速度为70 km s $^{-1}$，多普勒宽度分布在10 km s $^{-1}$左右。基于这些结果，预期He I极化信号的前向模型使我们能够使用合成观测值和反演算法（包括适合散射角约束材料沿视线的位置）来估计即将到来的美国国家科学基金会的Daniel K. Inouye太阳望远镜。我们预测联合观测的He I 10830 $Å$和5876 $Å$多重，使用第一光仪器，将提供反向磁场错误的$\pm3.5$ G（$2σ$）的空间尺度的$0.5''$（$\sim360$公里）假设动态有限的积分时间为5.5秒。
英文摘要：
On account of its polarizability and magnetic field sensitivity, as well as the role of neutral helium in partially ionized solar environments, the neutral helium triplet (orthohelium) system provides important, yet under-utilized, diagnostics of solar coronal rain. This work describes off-limb observations of coronal rain in NOAA Active Region 12468 obtained in the He I 10830 $Å$ triplet using the Massively MultipleXed Imaging Spectrograph experiment at the Dunn Solar Telescope along with co-temporal observations from NASA's Solar Dynamics Observatory and the Interface Region Imaging Spectrograph. We detect rain simultaneously in the IRIS 1400 $Å$ and 2796 $Å$ channels and in He I 10830 $Å$. The large degree of spatial coherence present between all channels agrees with previous observations of the multi-thermal nature of coronal rain. A statistical analysis of He I spectral profiles for rain identified via automated detection indicate He I line radiances are, on average, $10^{4}$ ergs cm$^{-2}$ s$^{-1}$ sr$^{-1}$; the average translational velocity is 70 km s$^{-1}$ and Doppler widths are distributed around 10 km s$^{-1}$. Based on these results, forward models of expected He I polarized signals allow us to estimate, using synthetic observables and an inversion algorithm including fits for the scattering angle constraining the material's location along-the-line of sight, the magnetic sensitivity of the upcoming National Science Foundation's Daniel K. Inouye Solar Telescope. We predict joint observations of the He I 10830 $Å$ and 5876 $Å$ multiplets, using first-light instrumentation, will provide inverted magnetic field errors of $\pm3.5$ G ($2σ$) for spatial scales of $0.5''$ ($\sim360$ km) assuming dynamically-limited integration times of 5.5 seconds.
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。
