DOI: 10.1038/ngeo2779
论文题名: Evidence for a dynamic nanodust cloud enveloping the Moon
作者: Wooden D.H. ; Cook A.M. ; Colaprete A. ; Glenar D.A. ; Stubbs T.J. ; Shirley M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 9 起始页码: 665
结束页码: 668
语种: 英语
Scopus关键词: dust
; hypothesis testing
; Moon
; nanoparticle
; particulate matter
; satellite altimetry
; solar wind
英文摘要: The exospheres that surround airless bodies such as the Moon are tenuous, atmosphere-like layers whose constituent particles rarely collide with one another. Some particles contained within such exospheres are the product of direct interactions between airless bodies and the space environment, and offer insights into space weathering processes. NASA's Lunar Atmosphere and Dust Environment Explorer (LADEE) mission studied the Moon's exospheric constituents in situ and detected a permanent dust exosphere of particles with radii as small as 300 nm. Here we present evidence from LADEE spectral data for an additional fluctuating nanodust exosphere at the Moon containing a population of particles sufficiently dense to be detectable via scattered sunlight. We compare two anti-Sun spectral observations: one near the peak of the Quadrantid meteoroid stream, the other during a period of comparatively weak stream activity. The former shows a negative spectral slope consistent with backscattering of sunlight by nanodust grains with radii less than 20 to 30 nm; the latter has a flatter spectral slope. We hypothesize that a spatially and temporally variable nanodust exosphere may exist at the Moon, and that it is modulated by changes in meteoroid impact rates, such as during encounters with meteoroid streams. The findings suggest that similar nanodust exospheres-and the particle ejection and transport processes that form them-may occur at other airless bodies. © 2016 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105937
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: NASA Ames Research Center, Moffett Field, CA, United States; Millenium Engineering AndIntegration Company, 350 North Akron Road Building, Moffett Field, CA, United States; University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD, United States
Recommended Citation:
Wooden D.H.,Cook A.M.,Colaprete A.,et al. Evidence for a dynamic nanodust cloud enveloping the Moon[J]. Nature Geoscience,2016-01-01,9(9)