The EUV Reflectance of Mercury's Surface Measured by BepiColombo/PHEBUS

The EUV Reflectance of Mercury's Surface Measured by BepiColombo/PHEBUS
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BepiColombo/PHEBUS 测量的水星表面 EUV 反射率

DOI:
10.1029/2022je007669
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发表时间:
2023
期刊:
JGR planets
影响因子:
--
通讯作者:
A. J. Corso
A. J. Corso
中科院分区:
--
文献类型:
--
作者:
J.Y. Chaufray;E. Qumerais;D. Koutroumpa;R. Robidel;F. Leblanc;A. Rberac;I. Yoshikawa;K. Yoshioka;G. Murakami;O. Korablev;D. Belyaev;M. G. Pelizzo;A. J. Corso

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于2021年10月9日及10日,BepiColombo号上透过紫外光谱探测Hermean外逸层观测到水星在90-160 nm光谱范围内以70°相位角从太阳反射的圆盘积分反射光。这些观测结果被用来推导水星表面在这个波长范围内的EUV反射率,这是自1974-1975年水手10号观测以来的第一次。我们的观测结果与水星表面在这个波长范围内比月球暗0.5-0.6倍的情况一致,在相位角为70°时平均反射率为0.3%。汞的反射率较低可能是由于FeO的丰度较低。在相似的相位角下,在160 nm附近导出的反射率接近于MESSENGER/MASCS在220 nm处导出的反射率。在110和140 nm之间测量到的可能的光谱变化可以归因于SiO2玻璃,但是信噪比很低,需要在剩余巡航期间的几个时期进行其他观测来确认最后的结果。
On 9 and 10 October 2021, Probing the Hermean Exosphere by Ultraviolet Spectroscopy aboard BepiColombo observed the disk‐integrated reflected light from the Sun by Mercury in the spectral range 90–160 nm at a phase angle of 70°. These observations are used to derive the EUV reflectance of the surface of Mercury in this wavelength range for the first time since the Mariner 10 observations in 1974–1975. Our observations are in agreement with a surface of Mercury darker by a factor ∼0.5–0.6 compared to the Moon in this wavelength range, with an average reflectance of 0.3% at a phase angle of 70°. This lower reflectance of Mercury could be due to the lower abundance of FeO. The derived reflectance near 160 nm is close to the derived reflectance at 220 nm by MESSENGER/MASCS at a similar phase angle. Possible spectral variations measured between 110 and 140 nm could be attributed to SiO2glass, but the signal to noise ratio is low and other observations, possible at several periods during the rest of the cruise, are needed to confirm this last result.
太阳系天体和日光层远紫外光谱的交叉校准
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