气候变化领域集成服务门户(CCPortal): A Long-Lasting Auroral Spiral Rotating Around Saturn's Pole

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DOI	10.1029/2020GL088810
	A Long-Lasting Auroral Spiral Rotating Around Saturn's Pole
	Palmaerts B.; Yao Z.H.; Sergis N.; Guo R.L.; Grodent D.; Dialynas K.; Gérard J.-C.; Mitchell D.G.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:23
英文摘要	The main ultraviolet auroral emission at Saturn consists of multiple structures forming a discontinuous ring of emission around the poles, occasionally organized in a global spiral. We present continuous observation of an auroral spiral rotating at ∼85% of rigid corotation during several hours. Simultaneously, energetic neutral atom (ENA) emissions revealed a hot magnetospheric plasma population located in the same local time sector as the ends of the rotating spiral. Following plasma theory, we propose that pressure gradients induced by the energized plasma distorted the magnetospheric current system, resulting in the spiral morphology of the aurora. The rotating hot plasma was several times reenergized in the dusk sector during at least 2 days, generating a long-lasting auroral spiral. The ultraviolet spiral, the ENA emissions, and the ions revealed by this multi-instrument data set are three signatures of a magnetosphere-ionosphere coupling current system and of the associated hot plasma population rotating around Saturn. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Electric fields; Ionosphere; Magnetosphere; Plasma theory; Poles; Population statistics; Auroral emission; Continuous observation; Energetic neutral atoms; Long lasting; Magnetosphere-ionosphere coupling; Magnetospheric current system; Magnetospheric plasmas; Multiple structures; Planets; aurora; interplanetary dust; planetary atmosphere; plasma; rotation; Saturn; ultraviolet radiation
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/169325
作者单位	Laboratoire de Physique Atmosphérique et Planétaire, Space sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, Liège, Belgium; Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; Office of Space Research and Technology, Academy of Athens, Athens, Greece; Institute of Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Athens, Greece; Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, United States
推荐引用方式 GB/T 7714	Palmaerts B.,Yao Z.H.,Sergis N.,et al. A Long-Lasting Auroral Spiral Rotating Around Saturn's Pole[J],2020,47(23).
APA	Palmaerts B..,Yao Z.H..,Sergis N..,Guo R.L..,Grodent D..,...&Mitchell D.G..(2020).A Long-Lasting Auroral Spiral Rotating Around Saturn's Pole.Geophysical Research Letters,47(23).
MLA	Palmaerts B.,et al."A Long-Lasting Auroral Spiral Rotating Around Saturn's Pole".Geophysical Research Letters 47.23(2020).