论文标题
2019年总太阳日食期间的冠状密度，温度和丰度：多波长观测在冠状血浆表征中的作用
Coronal Densities, Temperatures and Abundances During the 2019 Total Solar Eclipse: The Role of Multi-Wavelength Observations in Coronal Plasma Characterization
论文作者
论文摘要
机载红外光谱仪（Air-Spec）为探索近红外（NIR）波长范围提供了前所未有的机会。它在2017年和2019年的两次太阳能日食中飞行。第二次飞行（2019年7月2日）在第二次飞行中的波长范围被移动，以覆盖S XI的两种密度敏感线。在本文中，我们通过比较东方上方的空气特征缝隙位置和西肢的温度，电子密度和元素丰度的详细诊断方法与Hinode/eis，PolarCAM检测器和SDO/AIA的诊断。我们发现从EIS EUV线比，NIR S XI比以及从极化亮度极性偏极层测量获得的电子密度的一致性。电子密度范围从log ne [cm $^{ - 3}] $ = 8.4附近，肢体附近，跌至$ r_0 = 1.3 $的7.2。 EIS光谱表明，西肢上方的温度分布接近1.3 mk，而东部的温度分布在1.3 mk左右，而东部的温度分布却具有额外的较高T分量。 Si X和S XI中的空气特异性radiances以及171、193和211埃埃斯特罗姆斯频段中的AIA数据与EIS结果一致。 EIS和空气规格的数据表明，在两个区域中，硫丰度（相对于硅）都是光电的，这证实了我们先前的2017年食物结果。 AIA数据还表明绝对的铁丰度是光电的。 我们的分析证实了NIR波长范围的诊断潜力的重要性，并且该重要的波长范围可以可靠，独立地使用以确定冠状血浆参数。
The Airborne Infrared Spectrometer (AIR-Spec) offers an unprecedented opportunity to explore the Near Infra-Red (NIR) wavelength range. It has been flown at two total solar eclipses, in 2017 and 2019. The wavelength range of the much improved instrument on the second flight (July 2, 2019) was shifted to cover two density sensitive lines from S XI. In this paper we study detailed diagnostics for temperature, electron density and elemental abundances by comparing results from AIR-Spec slit positions above the east and the west limb with those from Hinode/EIS, the PolarCam detector and SDO/AIA. We find very good agreement in the electron densities obtained from the EIS EUV line ratios, those from the NIR S XI ratio and those obtained from the polarized brightness PolarCam measurements. Electron densities ranged from Log Ne [cm$^{-3}]$ = 8.4 near the limb, falling to 7.2 at $R_0=1.3$. EIS spectra indicate that the temperature distribution above the west limb is near-isothermal at around 1.3 MK, while that on the east has an additional higher-T component. The AIR-Spec radiances in Si X and S XI as well as the AIA data in the 171, 193, and 211 Angstroms bands are consistent with the EIS results. EIS and AIR-Spec data indicate that the sulphur abundance (relative to silicon) is photospheric in both regions, confirming our previous results of the 2017 eclipse. The AIA data also indicate that the absolute iron abundance is photospheric. Our analysis confirms the importance of the diagnostic potential of the NIR wavelength range, and that this important wavelength range can be used reliably and independently to determine coronal plasma parameters.
