月球光照区尘埃静电迁移规律:初步理论结果（英文）

发布时间：2018-02-16 18:48

本文关键词： 月球月尘静电迁移月球尘埃实验　出处：《岩石学报》2016年01期 　论文类型：期刊论文

【摘要】：空间环境中,暴露在太阳风等离子体和紫外辐射中的尘埃颗粒由于光电发射等而带电。月球光照区带电的尘埃颗粒受静电场驱动或微陨石轰击发生迁移。本文计算结果表明,月球光照区粒径为0.01μm的尘埃颗粒静电迁移达到的最大高度约为1km,而在月球黑暗区亚微米级的尘埃颗粒静电迁移可以到达50km的高度。尽管微陨石轰击溅射的尘埃颗粒可到达~100km的高度,但是尘埃数密度与微陨石轰击事件直接相关,并随着高度变化。由于重力作用,溅射的尘埃快速沉降。溅射和沉降过程中,尘埃颗粒由于光电发射等继续充电。在局部电场强度和德拜鞘高度分别为5V/m和1m条件下,粒径0.37μm的带电尘埃颗粒以"弹跳模式"运动,而粒径0.37μm的带电尘埃颗粒返回月表,并再次轰击溅射尘埃。根据本文结果可以雅断,月球尘埃实验(LDEX)在月球夜晚20~60km高度记录的尘埃事件可能与尘埃的静电迁移相关,但是月球白天记录的事件可能并不包括静电迁移的部分。
[Abstract]:In the space environment, dust particles exposed to solar wind plasma and ultraviolet radiation are charged due to photoemission, etc. The charged dust particles in the lunar illumination region are transported by electrostatic field or micrometeorite bombardment. The maximum height of electrostatic migration of dust particles of 0.01 渭 m in the illumination area of the moon is about 1km, while that of sub-micron dust particles in the dark area of the moon can reach an altitude of 50km. Although the micrometeorite bombarded the sputtered dust particles. The particle can reach the height of 100 km, But the dust number density is directly related to the micrometeorite bombardment events, and varies with the height. When the local electric field intensity and Debye sheath height are 5 V / m and 1 m respectively, the charged dust particles with the diameter of 0.37 渭 m move in the "bouncing mode", while the charged dust particles with the diameter of 0.37 渭 m return to the monthly table. According to the results of this paper, the dust events recorded by the lunar dust experiment LDEX at an altitude of 2060 km at night may be related to the electrostatic transport of dust. But the lunar events recorded during the day may not include a part of electrostatic migration.
【作者单位】：中国科学院地球化学研究所月球与行星科学研究中心;中国科学院大学;中国科学院地球化学研究所环境地球化学国家重点实验室;
【基金】：supported by the National Natural Science Foundation of China(General Program:No.41373067 and Major Program:No.41490630) the Macau FDCT program(020/2014/A1)
【分类号】：P184

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