Auroral Beads at Saturn and the Driving Mechanism: Cassini Proximal Orbits

doi:10.3847/2041-8213/ab4e20

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院地球与行星物理重点实验室

	Auroral Beads at Saturn and the Driving Mechanism: Cassini Proximal Orbits
	Radioti,A.8; Yao,Zhonghua 7,8; Grodent,Denis 8; Palmaerts,B.8; Roussos,E.6; Dialynas,K.5; Mitchell,D.4; Pu,Z.3; Badman,S. V.2; Gérard,J.-C.8
刊名	The Astrophysical Journal Letters
	2019-10-30
卷号	885 期号:1
关键词	Space plasmas Saturn Ultraviolet transient sources
ISSN号	2041-8205
DOI	10.3847/2041-8213/ab4e20
英文摘要	Abstract During the Grand Finale Phase of Cassini, the Ultraviolet Imaging Spectrograph on board the spacecraft detected repeated detached small-scale auroral structures. We describe these structures as auroral beads, a term introduced in the terrestrial aurora. Those on DOY 232 2017 are observed to extend over a large range of local times, i.e., from 20 LT to 11 LT through midnight. We suggest that the auroral beads are related to plasma instabilities in the magnetosphere, which are often known to generate wavy auroral precipitations. Energetic neutral atom enhancements are observed simultaneously with auroral observations, which are indicative of a heated high pressure plasma region. During the same interval we observe conjugate periodic enhancements of energetic electrons, which are consistent with the hypothesis that a drifting interchange structure passed the spacecraft. Our study indicates that auroral bead structures are common phenomena at Earth and giant planets, which probably demonstrates the existence of similar fundamental magnetospheric processes at these planets.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:2041-8205-885-1-AB4E20
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/93873]
专题	地质与地球物理研究所_中国科学院地球与行星物理重点实验室
作者单位	1.Science Department, Central Arizona College, Coolidge, AZ, USA 2.Department of Physics, Lancaster University, Bailrigg, Lancaster LA1 4YB, UK 3.School of Earth and Space Sciences, Peking University, Beijing, People’s Republic of China 4.Applied Physics Laboratory, The Johns Hopkins University, Laurel, MD 20723, USA 5.Office of Space Research and Technology, Academy of Athens, Athens 10679, Greece 6.Max Planck Institute for Solar System Research, Goettingen, Germany 7.Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, People’s Republic of China 8.Laboratoire de Physique Atmosphérique et Planétaire, STAR Institute, Université de Liège, Liège, Belgium; zhonghua.yao@uliege.be
推荐引用方式 GB/T 7714	Radioti,A.,Yao,Zhonghua,Grodent,Denis,et al. Auroral Beads at Saturn and the Driving Mechanism: Cassini Proximal Orbits[J]. The Astrophysical Journal Letters,2019,885(1).
APA	Radioti,A..,Yao,Zhonghua.,Grodent,Denis.,Palmaerts,B..,Roussos,E..,...&Bonfond,B..(2019).Auroral Beads at Saturn and the Driving Mechanism: Cassini Proximal Orbits.The Astrophysical Journal Letters,885(1).
MLA	Radioti,A.,et al."Auroral Beads at Saturn and the Driving Mechanism: Cassini Proximal Orbits".The Astrophysical Journal Letters 885.1(2019).