气候变化领域集成服务门户(CCPortal): Simultaneous Observation of Negatively and Positively Charged Nanograins at Comet 67P/Churyumov-Gerasimenko

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DOI	10.1029/2019GL086147
	Simultaneous Observation of Negatively and Positively Charged Nanograins at Comet 67P/Churyumov-Gerasimenko
	LLera K.; Burch J.L.; Goldstein R.; Goetz C.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:4
英文摘要	Observations near comet 67P by Rosetta show evidence of charged nanograins. Specifically, the ion and electron sensor (IES) observed negative particles with energy/charge (E/q) consistent with charged nanograins. However, theory predicts that both polarities should be present. On 19 September 2014, IES detected positively and negatively charged particles with E/q up to the maximum detectable by IES (~17 keV/q) coming roughly from the Sun. The arrival directions of the negative and positive particles were different and consistent with their different charges. This observation is the first simultaneous measurement of positively and negatively charged nanograins by a plasma detector in a cometary environment. As observed previously for negative nanograins coming from the comet, we find similar peaks for the picked up negative nanograins, but only one peak for the positive ones. These E/q peaks are interpreted as different charge states since they occur at discrete multiples (1:3 in this event). © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Earth sciences; Geophysics; comet; Electron sensors; Nano grains; Negatively charged; Positively charged; Rosetta; Simultaneous measurement; Simultaneous observation; Charged particles; atmospheric electricity; observational method; sensor
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/170641
作者单位	Southwest Research Institute, San Antonio, TX, United States; Technical University of Braunschweig, Braunschweig, Germany; ESA/ESTEC, Noordwijk, Netherlands
推荐引用方式 GB/T 7714	LLera K.,Burch J.L.,Goldstein R.,et al. Simultaneous Observation of Negatively and Positively Charged Nanograins at Comet 67P/Churyumov-Gerasimenko[J],2020,47(4).
APA	LLera K.,Burch J.L.,Goldstein R.,&Goetz C..(2020).Simultaneous Observation of Negatively and Positively Charged Nanograins at Comet 67P/Churyumov-Gerasimenko.Geophysical Research Letters,47(4).
MLA	LLera K.,et al."Simultaneous Observation of Negatively and Positively Charged Nanograins at Comet 67P/Churyumov-Gerasimenko".Geophysical Research Letters 47.4(2020).