Solar polarimetry in the K I D2 line : A novel possibility for a stratospheric balloon

Solar polarimetry in the K I D2 line : A novel possibility for a stratospheric balloon
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K I D2 线中的太阳偏振测量:平流层气球的新可能性

DOI:
10.1051/0004-6361/201732111
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发表时间:
2018
影响因子:
6.5
通讯作者:
C. et al.
C. et al.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Quintero Noda;C. et al.

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在两条太阳谱线K ID 1和D2中,迄今为止几乎所有的注意力都集中在D1谱线上,因为D2受到O2大气带的严重影响。然而,这使得后者对气球和空间观测的吸引力来自地球大气层上方(大部分)。我们估计的剩余效应的O2波段上的K ID2线在典型的平流层气球的高度。我们的目标是研究观察770 nm窗口的可行性。具体而言,本文作为日出气球载观测站的第三次飞行的准备。结果表明,O2的吸收仍然存在,虽然弱得多,在预期的气球高度。我们将得到的O2透过率应用于K ID2合成偏振光谱,发现在没有视线运动的情况下,残余O2对K ID2线的影响可以忽略不计。另一方面,对于多普勒频移的KID2数据,残余O2可能会改变斯托克斯轮廓的形状。然而,剩余的O2吸收在平流层水平上足够弱,如果进行适当的测量,它可以被分开,这在地面水平上是不可能的。因此,第一次与日出III,我们将能够进行偏振观测的K ID 2线,因此,我们将有更好的访问热力学和磁性的上层光球从K I线的观测。
Of the two solar lines, K ID1andD2, almost all attention so far has been devoted to theD1line, asD2is severely affected by an O2atmospheric band. This, however, makes the latter appealing for balloon and space observations from above (most of) the Earth’s atmosphere. We estimate the residual effect of the O2band on the K ID2line at altitudes typical for stratospheric balloons. Our aim is to study the feasibility of observing the 770 nm window. Specifically, this paper serves as a preparation for the third flight of the Sunrise balloon-borne observatory. The results indicate that the absorption by O2is still present, albeit much weaker, at the expected balloon altitude. We applied the obtained O2transmittance to K ID2synthetic polarimetric spectra and found that in the absence of line-of-sight motions, the residual O2has a negligible effect on the K ID2line. On the other hand, for Doppler-shifted K ID2data, the residual O2might alter the shape of the Stokes profiles. However, the residual O2absorption is sufficiently weak at stratospheric levels that it can be divided out if appropriate measurements are made, something that is impossible at ground level. Therefore, for the first time with Sunrise III, we will be able to perform polarimetric observations of the K ID2line and, consequently, we will have improved access to the thermodynamics and magnetic properties of the upper photosphere from observations of the K I lines.
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期刊: Solar Physics
影响因子: 2.8
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DOI: --
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