The Color and Brightness of the F-corona Inferred from the 2019 July 2 Total Solar Eclipse
The Color and Brightness of the F-corona Inferred from the 2019 July 2 Total Solar Eclipse
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DOI：
10.3847/1538-4357/abea79
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发表时间：
2021-05-01
影响因子：
4.9
通讯作者：
Druckmuller, Miloslav
中科院分区：
文献类型：
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作者：
Boe, Benjamin;Habbal, Shadia;Druckmuller, Miloslav
日全食(TSE)提供了一个独特的机会来量化K日冕(电子)、F日冕(尘埃)和E日冕(离子)从太阳表面到几个太阳半径的性质。我们应用一种新的反演方法来分离K-和F-日冕连续体的发射，该方法使用2019年7月2日TSE期间从529.5到788.4 nm之间获取的五个0.5 nm带通的未极化总亮度(TB)观测。相对于F日冕本身光球(即颜色)的波长依赖关系被用来推断每条视线的K日冕和F日冕的Tb。我们将我们的K-日冕发射结果与莫纳罗亚太阳天文台(MLSO)从日食当天的K-COR极化亮度(PB)观测结果以及预测科学公司(PSI)磁流体(MHD)模型预测的K-日冕强度进行了比较。我们的结果与前人的工作基本一致，并与MLSO数据和PSI-MHD预测很好地匹配，支持了我们的方法和PSI-MHD模型的有效性。然而，我们发现F-日冕的Tb在低日冕中比预期的要高，这可能表明F-日冕略有极化-挑战了F-日冕完全不极化的常见假设。
Total solar eclipses (TSEs) provide a unique opportunity to quantify the properties of the K-corona (electrons), F-corona (dust), and E-corona (ions) continuously from the solar surface out to a few solar radii. We apply a novel inversion method to separate emission from the K- and F-corona continua using unpolarized total brightness (tB) observations from five 0.5 nm bandpasses acquired during the 2019 July 2 TSE between 529.5 and 788.4 nm. The wavelength dependence relative to the photosphere (i.e., color) of the F-corona itself is used to infer the tB of the K- and F-corona for each line of sight. We compare our K-corona emission results with the Mauna Loa Solar Observatory (MLSO) K-Cor polarized brightness (pB) observations from the day of the eclipse, and the forward modeled K-corona intensity from the Predictive Science Inc. (PSI) magnetohydrodynamic (MHD) model prediction. Our results are generally consistent with previous work and match both the MLSO data and PSI-MHD predictions quite well, supporting the validity of our approach and of the PSI-MHD model. However, we find that the tB of the F-corona is higher than expected in the low corona, perhaps indicating that the F-corona is slightly polarized-challenging the common assumption that the F-corona is entirely unpolarized.