DOI: 10.1002/2015GL064746
论文题名: Detections of lunar exospheric ions by the LADEE neutral mass spectrometer
作者: Halekas J.S. ; Benna M. ; Mahaffy P.R. ; Elphic R.C. ; Poppe A.R. ; Delory G.T.
刊名: Geophysical Research Letters
ISSN: 0094-9217
EISSN: 1944-8948
出版年: 2015
卷: 42, 期: 13 起始页码: 5162
结束页码: 5169
语种: 英语
英文关键词: exosphere
; Moon
; plasma
Scopus关键词: Carbon
; Ionosphere
; Mass spectrometers
; Moon
; Plasmas
; Spectrometers
; Carbon bearing
; Dust environment
; exosphere
; Ion production
; Lunar atmospheres
; Lunar exospheres
; Sensitive detection
; Source mechanisms
; Ions
; dust
; magnetic field
; mass spectrometry
; Moon
; planetary atmosphere
; plasma
; turbulence
英文摘要: The Lunar Atmosphere and Dust Environment Explorer (LADEE) Neutral Mass Spectrometer (NMS), operating in ion mode, provides sensitive detections of ions from the lunar exosphere. By analyzing ion-mode data from the entire mission, utilizing Acceleration, Reconnection, Turbulence, and Electrodynamics of the Moon's Interaction with the Sun (ARTEMIS) plasma and magnetic field measurements to organize NMS data and eliminate background sources, we identify highly significant detections of lunar ions at mass per charge of 2, 4, 12, 20, 28, 39, and 40, moderately significant detections at 14 and 23, and weak detections at 24, 25, and 36. Unlike many previous observations of Moon-derived ions, an outward pointing viewing geometry ensures that these ions originate from the exosphere, rather than directly from the surface. For species with known neutral distributions, inferred ion production rates appear consistent with expectations for both magnitude and spatial distribution, assuming photoionization as the predominant source mechanism. Unexpected signals at mass per charge 12 and 28 suggest the presence of a significant exospheric population of carbon-bearing molecules. Key Points The LADEE neutral mass spectrometer detected exospheric ions at the Moon NMS detected H2 +, He+, C+, Ne+, Na+, K+, Ar+, and an ambiguous 28 amu ion Simultaneous plasma data are critical for interpreting NMS ion measurements. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938151186&doi=10.1002%2f2015GL064746&partnerID=40&md5=88bd13dfd6f411165dfc695a247b315b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8833
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Physics and Astronomy, University of Iowa, Iowa City, IA, United States
Recommended Citation:
Halekas J.S.,Benna M.,Mahaffy P.R.,et al. Detections of lunar exospheric ions by the LADEE neutral mass spectrometer[J]. Geophysical Research Letters,2015-01-01,42(13).