Detection of lunar water, hydroxyl ion and their diurnal changes from CHACE-2 orbiter observation

IF 2.5 2区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Icarus Pub Date : 2024-10-31 DOI:10.1016/j.icarus.2024.116365

Swastika Chakraborty , Barun Raychaudhuri , Tirtha Pratim Das , Saurabh Das , Moumita Roy

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Abstract

This work reports the spatial and diurnal variations of the number densities of lunar molecular water (H₂O), atomic mass unit (amu) 18 and hydroxyl (OH), amu 17 over low (0° to 30°), middle (31° to 60°) and high (61° to 80°) latitudinal regions of the lunar exosphere during the pre-sunrise, noon, sunset and midnight periods using the mass spectrometric data of CHandra's Atmospheric Composition Explorer-2 (CHACE-2) on board Chandrayaan-2, the second lunar mission developed in India. Both H₂O and OH exhibit, particularly in the low latitude regions, a trend of increasing number density after the sunrise and up to noon, followed by a decrease till sunset. An overall higher density of H₂O is obtained compared to the previous reports. The findings are justified in terms of the polar orbital height of the instrument and the duration of data procurement. The maximum number density for the low, middle and high latitudes reaches 5225 cm⁻³, 5135 cm⁻³ and 3747 cm⁻³, respectively. The corresponding OH abundances are found to be 5079 cm⁻³, 5565 cm⁻³ and 5720 cm⁻³. The diurnal variations of H₂O and OH and their comparisons, similar to those of the present report may provide suitable means for tracing the lunar water cycle. The CHACE-2 observations imply that the influence of magnetotail passage on volatiles like water is to be further quantified in future missions with other sensors.

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从CHACE-2轨道器观测中探测月球水、羟基离子及其昼夜变化

这项工作报告了月球外大气层低纬度（0°至 30°）、中纬度（31°至 60°）和高纬度（61°至 80°）区域在日出前、正午、日落和午夜期间月球分子水（H2O）原子质量单位（amu）18 和羟基（OH）原子质量单位（amu）17 的数量密度的空间和昼夜变化、利用印度开发的第二个月球任务 Chandrayaan-2 号上的 CHandra's Atmospheric Composition Explorer-2 (CHACE-2) 的质谱数据，对日出前、正午、日落和午夜期间的月球外大气层进行了分析。特别是在低纬度地区，H2O 和 OH 的数量密度在日出后至正午前呈上升趋势，随后下降，直至日落。与以前的报告相比，H2O 的密度总体较高。从仪器的极轨道高度和数据采集的持续时间来看，这些发现都是合理的。低纬度、中纬度和高纬度的最大数量密度分别达到 5225 cm-3、5135 cm-3 和 3747 cm-3。相应的 OH 丰度分别为 5079 cm-3、5565 cm-3 和 5720 cm-3。与本报告类似，H2O 和 OH 的昼夜变化及其比较可为追踪月球水循环提供合适的方法。CHACE-2 的观测结果表明，磁尾通过对水等挥发物的影响需要在今后的飞行任务中利用其他传感器进一步量化。

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来源期刊

Icarus 地学天文-天文与天体物理

CiteScore

6.30

自引率

18.80%

发文量

356

审稿时长

2-4 weeks

期刊介绍： Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.