Synodic and semiannual oscillations of argon‐40 in the lunar exosphere
Synodic and semiannual oscillations of argon‐40 in the lunar exosphere
复制标题
月球外逸层中 argon-40 的会动和半年振荡
DOI：
10.1002/2015gl067293
复制
发表时间：
2016
影响因子：
5.2
通讯作者：
P. Mahaffy
中科院分区：
文献类型：
--
作者：
R. Hodges;P. Mahaffy
月球大气和尘埃环境探测器（LADEE）航天器上的中性质谱仪收集了大量的外逸层数据，其中包括一组在142天内对放射性40 Ar的高质量测量。使用成熟的散逸层模拟工具进行的数据合成研究表明，LADEE氩数据与以吸附为主的散逸层-风化层相互作用一致，解吸过程产生了出口速度的Armand分布。合成工作揭示了氩的明显的半年振荡，这与月球在两极产生的季节性冷阱中的时间隔离是一致的。此外，LADEE的数据提供了新的见解的原始性质的月壤，其空间变化的吸附性能，和吸附过程的影响上的会合振荡的氩散逸层。
The neutral mass spectrometer on the Lunar Atmosphere and Dust Environment Explorer (LADEE) spacecraft collected a trove of exospheric data, including a set of high‐quality measurements of radiogenic 40Ar over a period of 142 days. Data synthesis studies, using well‐established exosphere simulation tools, show that the LADEE argon data are consistent with an exosphere‐regolith interaction that is dominated by adsorption and that the desorption process generates the Armand distribution of exit velocities. The synthesis work has uncovered an apparent semiannual oscillation of argon that is consistent with temporal sequestration in the seasonal cold traps created at the poles by the obliquity of the Moon. In addition, the LADEE data provide new insight into the pristine nature of lunar regolith, its spatially varying sorption properties, and the influence of sorption processes on the synodic oscillation of the argon exosphere.