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Long-standing Small-scale Reconnection Processes at Saturn Revealed by Cassini
Guo,R. L.1,2; Yao,Z. H.3; Sergis,N.4,5; Wei,Y.1,6; Xu,X. J.2; Coates,A. J.7; Delamere,P. A.8; Roussos,E.9; Arridge,C. S.10; Waite,J. H.11; Krupp,N.9; Mitchell,D.12; Burch,J.11; Dougherty,M. K.13; Wan,W. X.1,6
Source PublicationThe Astrophysical Journal Letters
AbstractAbstract The internal mass source from the icy moon Enceladus in Saturn’s rapidly rotating magnetosphere drives electromagnetic dynamics in multiple spatial and temporal scales. The distribution and circulation of the internal plasma and associated energy are thus crucial in understanding Saturn’s magnetospheric environment. Magnetic reconnection is one of the key processes in driving plasma and energy transport in the magnetosphere, and also a fundamental plasma process in energizing charged particles. Recent works suggested that reconnection driven by Saturn’s rapid rotation might appear as a chain of microscale structures, named drizzle-like reconnection. The drizzle-like reconnection could exist not only in the nightside magnetodisk, but also in the dayside magnetodisk. Here, using in situ measurements from the Cassini spacecraft, we report multiple reconnection sites that were successively detected during a time interval longer than one rotation period. The time separation between two adjacently detected reconnection sites can be much less than one rotation period, implying that the reconnection processes are likely small-scale, or frequently repetitive. The spatial distribution of the identified long-standing multiple small reconnection site sequences shows no significant preference on local times. We propose that the small reconnection sites discussed in this Letter are rotationally driven and rotate with the magnetosphere. Since the reconnection process on Saturn can be long-durational, the rotational regime can cause these small-scale reconnection sites to spread to all local times, resulting in global release of energy and mass from the magnetosphere.
KeywordSolar magnetic reconnection Planetary magnetosphere Interplanetary particle acceleration
WOS IDIOP:2041-8205-884-1-ab4429
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, People’s Republic of China
2.State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Macao, People’s Republic of China
3.Laboratoire de Physique Atmospherique et Planetaire, STAR institute, Universite de Liege, Liege, Belgium
4.Office for Space Research and Technology, Academy of Athens, Athens, Greece
5.Institute of Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, Athens, Greece
6.College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, People’s Republic of China
7.UCL Mullard Space Science Laboratory, Dorking, RH5 6NT, UK
8.University of Alaska Fairbanks, Geophysical Institute, 903 Koyokuk Drive, Fairbanks, AK 99775-7320, USA
9.Max-Planck-Institut für Sonnensystemforschung, G?ttingen, Germany
10.Department of Physics, Lancaster University, Bailrigg, Lancaster LA1 4YB, UK
11.Southwest Research Institute, San Antonio, TX, USA
12.Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA
13.Faculty of Natural Sciences, Department of Physics, Imperial College, London, UK
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Guo,R. L.,Yao,Z. H.,Sergis,N.,et al. Long-standing Small-scale Reconnection Processes at Saturn Revealed by Cassini[J]. The Astrophysical Journal Letters,2019,884(1).
APA Guo,R. L..,Yao,Z. H..,Sergis,N..,Wei,Y..,Xu,X. J..,...&Wan,W. X..(2019).Long-standing Small-scale Reconnection Processes at Saturn Revealed by Cassini.The Astrophysical Journal Letters,884(1).
MLA Guo,R. L.,et al."Long-standing Small-scale Reconnection Processes at Saturn Revealed by Cassini".The Astrophysical Journal Letters 884.1(2019).
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