DOI: 10.1002/2015GL065177
论文题名: Observation of charged nanograins at comet 67P/Churyumov-Gerasimenko
作者: Burch J.L. ; Gombosi T.I. ; Clark G. ; Mokashi P. ; Goldstein R.
刊名: Geophysical Research Letters
ISSN: 0094-9453
EISSN: 1944-9184
出版年: 2015
卷: 42, 期: 16 起始页码: 6575
结束页码: 6581
语种: 英语
英文关键词: comet
; nanograins
Scopus关键词: Earth sciences
; Geophysics
; 67p/churyumov-gerasimenko
; Comet
; Electron sensors
; Energy particles
; Measurements of
; Nano grains
; Solar radiation pressure
; Submicron-sized
; Electric fields
; comet
; energy efficiency
; nanoparticle
; solar power
; solar radiation
英文摘要: Soon after the Rosetta Orbiter rendezvoused with comet 67P/Churyumov-Gerasimenko at a solar distance of ∼3.5 AU and began to fly in triangular-shaped trajectories around it, the Ion and Electron Sensor detected negative particles at energies from about 100 eV/q to over 18 keV/q. The lower energy particles came from roughly the direction of the comet; the higher-energy particles came from approximately the solar direction. These particles are interpreted as clusters of molecules, most likely water, which we refer to as nanograins because their inferred diameters are less than 100 nm. Acceleration of the grains away from the comet is through gas drag by the expanding cometary atmosphere, while acceleration back to the vicinity of the comet is caused partly by solar radiation pressure but mainly by the solar wind electric field. These observations represent the first measurements of energetic charged submicron-sized dust or ice grains (nanograins) in a cometary environment. © 2015. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84941736679&doi=10.1002%2f2015GL065177&partnerID=40&md5=301f0cf2f7952e01dc24bf45b687f717
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9068
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: Southwest Research Institute, San Antonio, TX, United States
Recommended Citation:
Burch J.L.,Gombosi T.I.,Clark G.,et al. Observation of charged nanograins at comet 67P/Churyumov-Gerasimenko[J]. Geophysical Research Letters,2015-01-01,42(16).