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Auroral Beads at Saturn and the Driving Mechanism: Cassini Proximal Orbits
Radioti,A.1; Yao,Zhonghua1,2; Grodent,Denis1; Palmaerts,B.1; Roussos,E.3; Dialynas,K.4; Mitchell,D.5; Pu,Z.6; Badman,S. V.7; Gérard,J.-C.1; Pryor,W.8; Bonfond,B.1
Source PublicationThe Astrophysical Journal Letters
AbstractAbstract 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.
KeywordSpace plasmas Saturn Ultraviolet transient sources
WOS IDIOP:2041-8205-885-1-ab4e20
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Laboratoire de Physique Atmosphérique et Planétaire, STAR Institute, Université de Liège, Liège, Belgium; zhonghua.yao@uliege.be
2.Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, People’s Republic of China
3.Max Planck Institute for Solar System Research, Goettingen, Germany
4.Office of Space Research and Technology, Academy of Athens, Athens 10679, Greece
5.Applied Physics Laboratory, The Johns Hopkins University, Laurel, MD 20723, USA
6.School of Earth and Space Sciences, Peking University, Beijing, People’s Republic of China
7.Department of Physics, Lancaster University, Bailrigg, Lancaster LA1 4YB, UK
8.Science Department, Central Arizona College, Coolidge, AZ, USA
Recommended Citation
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).
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