Optical polarimetry of the May 2022 lunar eclipse
Optical polarimetry of the May 2022 lunar eclipse
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2022 年 5 月月食的光学偏振测量
DOI：
10.1093/mnras/stac2816
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发表时间：
2023
影响因子：
4.8
通讯作者：
Steele I
中科院分区：
文献类型：
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作者：
Steele I
在月全食期间从月球反射的阳光在前往月球的过程中穿过了地球的大气层。在传输过程中，多次散射和不均匀的大气特性相结合，可能会使该光偏振。从凌日系外行星的大气层中也应该可以观察到类似的效应(尽管小得多)。我们给出了2022年5月16日月全食前15分钟的偏振观测结果。我们得到的偏振度分别为2.1% Cent INB，1.2%±100.3% Cent Inv，0.5%±100.2% Cent INR，0.2%±100.2% Cent Inn。我们的偏振值位于之前日食报告范围的中间，这进一步证明了激发极化可以随着事件的不同而改变。我们发现，由于入射角度的不同，暗月面区域和附近明亮的高地之间或月球边缘和更靠近圆盘中心的区域之间没有显著的偏振差异(<；0.02% Cent)。这进一步加强了偏振起源是由于地球大气层中的散射而不是月球表层的解释。
The sunlight reflected from the Moon during a total lunar eclipse has been transmitted through the Earth’s atmosphere on the way to the Moon. The combination of multiple scattering and inhomogeneous atmospheric characteristics during that transmission can potentially polarize that light. A similar (although much smaller) effect should also be observable from the atmosphere of a transiting exoplanet. We present the results of polarization observations during the first 15 min of totality of the lunar eclipse of 2022 May 16. We find degrees of polarization of 2.1 ± 0.4 per cent inB, 1.2 ± 0.3 per cent inV, 0.5 ± 0.2 per cent inR, and 0.2 ± 0.2 per cent inI. Our polarization values lie in the middle of the range of those reported for previous eclipses, providing further evidence that the induced polarization can change from event to event. We found no significant polarization difference (<0.02 per cent) between a region of dark Mare and nearby bright uplands or between the lunar limb and regions closer to the disc centre due to the different angle of incidence. This further strengthens the interpretation of the polarization’s origin being due to scattering in the Earth’s atmosphere rather than by the lunar regolith.