J. S. Evans, J. Deighan, S. Jain, V. Veibell, J. Correira, H. Al Matroushi, H. Al Mazmi, M. Chaffin, S. Curry, N. El-Kork, S. England, F. Eparvier, M. Fillingim, G. Holsclaw, M. Khalil, R. Lillis, F. Lootah, S. Mahmoud, T. Plummer, E. Soto, J. Tennyson, E. Thiemann, S. N. Yurchenko
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引用次数: 0
摘要
阿联酋希望号火星探测器（EMM）上的阿联酋紫外线分光计（EMUS）以大约100到170纳米的波长对火星进行成像。EMUS的观测始于2021年2月，覆盖了整个火星年。我们报告了首次在火星边缘扫描观测到的紫外线发射Ar I 106.6 nm、N I 120 nm以及电子撞击CO激发的一氧化碳（CO）第四正组（A - X）波段系统。我们利用 EMUS 边缘扫描观测数据来获取火星 130 至 160 公里高层大气中的氩、分子氮、原子氧和一氧化碳的数量密度曲线。一氧化碳是火星中层大气热剖面和风以及平衡火星大气中二氧化碳的化学反应的灵敏示踪剂。EMUS插入轨道特别观测表明，火星热层的远紫外边缘测量值可以通过一种强大的检索算法进行光谱分析，以进一步量化火星高层大气中二氧化碳成分的变化。
Retrieval of Ar, N2, O, and CO in the Martian Thermosphere Using Dayglow Limb Observations by EMM EMUS
The Emirates Ultraviolet Spectrometer (EMUS) onboard the Emirates Mars Mission (EMM) Hope probe images Mars at wavelengths extending from approximately 100 to 170 nm. EMUS observations began in February 2021 and cover over a full Mars year. We report the first limb scan observations at Mars of ultraviolet emissions Ar I 106.6 nm, N I 120 nm, and carbon monoxide (CO) Fourth Positive Group (A − X) band system excited by electron impact on CO. We use EMUS limb scan observations to retrieve number density profiles of argon, molecular nitrogen, atomic oxygen, and CO in the upper atmosphere of Mars from 130 to 160 km. CO is a sensitive tracer of the thermal profile and winds in Mars' middle atmosphere and the chemistry that balances CO2 in the atmosphere of Mars. EMUS insertion orbit special observations demonstrate that far ultraviolet limb measurements of the Martian thermosphere can be spectroscopically analyzed with a robust retrieval algorithm to further quantify variations of CO composition in the Martian upper atmosphere.
期刊介绍：
The Journal of Geophysical Research Planets is dedicated to the publication of new and original research in the broad field of planetary science. Manuscripts concerning planetary geology, geophysics, geochemistry, atmospheres, and dynamics are appropriate for the journal when they increase knowledge about the processes that affect Solar System objects. Manuscripts concerning other planetary systems, exoplanets or Earth are welcome when presented in a comparative planetology perspective. Studies in the field of astrobiology will be considered when they have immediate consequences for the interpretation of planetary data. JGR: Planets does not publish manuscripts that deal with future missions and instrumentation, nor those that are primarily of an engineering interest. Instrument, calibration or data processing papers may be appropriate for the journal, but only when accompanied by scientific analysis and interpretation that increases understanding of the studied object. A manuscript that describes a new method or technique would be acceptable for JGR: Planets if it contained new and relevant scientific results obtained using the method. Review articles are generally not appropriate for JGR: Planets, but they may be considered if they form an integral part of a special issue.
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