气候变化领域集成服务门户(CCPortal): Detection of Negative Pickup Ions at Saturn's Moon Dione

CCPortal

DOI	10.1029/2020GL087543
	Detection of Negative Pickup Ions at Saturn's Moon Dione
	Nordheim T.A.; Wellbrock A.; Jones G.H.; Desai R.T.; Coates A.J.; Teolis B.D.; Jasinski J.M.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:7
英文摘要	We investigate a possible negative ion feature observed by the Cassini Plasma Spectrometer (CAPS) during a flyby of Saturn's moon Dione that occurred on 7 April 2010. By examining possible particle trajectories, we find that the observed particles are consistent with negative pickup ions originating near the moon's surface. We find that the mass of the negative pickup ions is in the range of 15–25 u and tentatively identify this species as O−, likely resulting from ionization and subsequent pickup from Dione's O2-CO2 exosphere. Our estimates show that the negative ion density is ~3 × 10−3 cm−3. This is comparable to, but slightly smaller than, that previously reported for the density of O2 + pickup ions for the same flyby, indicating that negative pickup ions may represent a major loss channel for Dione's exosphere. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Ionosphere; Moon; Negative ions; Planets; Cassini plasma spectrometer; Particle trajectories; Pick-up ions; Saturn's moons; Pickups
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170521
作者单位	Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Mullard Space Science Laboratory, University College London, Dorking, United Kingdom; Centre for Planetary Sciences at UCL/Birkbeck, University College London, London, United Kingdom; Blackett Laboratory, Imperial College London, London, United Kingdom; Division of Space Science and Engineering, Southwest Research Institute, San Antonio, TX, United States
推荐引用方式 GB/T 7714	Nordheim T.A.,Wellbrock A.,Jones G.H.,et al. Detection of Negative Pickup Ions at Saturn's Moon Dione[J],2020,47(7).
APA	Nordheim T.A..,Wellbrock A..,Jones G.H..,Desai R.T..,Coates A.J..,...&Jasinski J.M..(2020).Detection of Negative Pickup Ions at Saturn's Moon Dione.Geophysical Research Letters,47(7).
MLA	Nordheim T.A.,et al."Detection of Negative Pickup Ions at Saturn's Moon Dione".Geophysical Research Letters 47.7(2020).