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Recurrent Magnetic Dipolarization at Saturn: Revealed by Cassini

文献类型：期刊论文

作者Yao, Z. H.1; Radioti, A.1; Grodent, D.1; Ray, L. C.2; Palmaerts, B.1; Sergis, N.3,4; Dialynas, K.3; Coates, A. J.5; Arridge, C. S.2; Roussos, E.6
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
出版日期2018-10-01
卷号123期号:10页码:8502-8517
ISSN号2169-9380
DOI10.1029/2018JA025837
英文摘要Planetary magnetospheres receive plasma and energy from the Sun or moons of planets and consequently stretch magnetic field lines. The process may last for varied timescales at different planets. From time to time, energy is rapidly released in the magnetosphere and subsequently precipitated into the ionosphere and upper atmosphere. Usually, this energy dissipation is associated with magnetic dipolarization in the magnetosphere. This process is accompanied by plasma acceleration and field-aligned current formation, and subsequently auroral emissions are often significantly enhanced. Using measurements from multiple instruments on board the Cassini spacecraft, we reveal that magnetic dipolarization events at Saturn could reoccur after one planetary rotation and name them as recurrent dipolarizations. Three events are presented, including one from the dayside magnetosphere, which has no known precedent with terrestrial magnetospheric observations. During these events, recurrent energizations of plasma (electrons or ions) were also detected, which clearly demonstrate that these processes shall not be simply attributed to modulation of planetary periodic oscillation, although we do not exclude the possibility that the planetary periodic oscillation may modulate other processes (e.g., magnetic reconnection) which energizes particles. We discuss the potential physical mechanisms for generating the recurrent dipolarization process in a comprehensive view, including aurora and energetic neutral atom emissions. Plain Language Summary Using measurements from the Cassini spacecraft, we reveal a new feature of magnetic dipolarization at Saturn, that is, the magnetic signature repeat after one planetary rotation, which is named recurrent dipolarization. Up to hundreds of kiloelectron volt electrons and ions are identified for the recurrent dipolarization events, suggesting that these particles have experienced efficient acceleration and cannot be purely due to planetary modulation. It remains a mystery why the magnetic dipolarization process associated with energetic ions and electrons could reoccur after one planetary rotation. Moreover, dipolarization process in Saturn's dayside magnetosphere is reported for the first time at Saturn, which has no known precedent with terrestrial or other planetary magnetospheric observations. The results demonstrate that magnetosphere-ionosphere coupling dynamics at Saturn and Earth have fundamental similarities and differences.
WOS关键词FIELD OBSERVATIONS ; CURRENT SYSTEMS ; MAGNETOSPHERE ; MAGNETOTAIL ; RECONNECTION ; PERIOD ; FLOWS ; SPECTROMETER ; ASYMMETRIES ; INJECTIONS
资助项目European Union ; STFC Consolidated Grants[ST/K000977/1] ; STFC Consolidated Grants[ST/N000722/1] ; Belgian Fund for Scientific Research (FNRS) ; Belgian Federal Science Policy Office (BELSPO) via the PRODEX Programme of ESA ; STFC Ernest Rutherford Fellowship[ST/M005534/1] ; NASA ; ESA ; University of Liege ; STFC Consolidated Grant[ST/R000816/1]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000451038700027
出版者AMER GEOPHYSICAL UNION
资助机构European Union ; European Union ; STFC Consolidated Grants ; STFC Consolidated Grants ; Belgian Fund for Scientific Research (FNRS) ; Belgian Fund for Scientific Research (FNRS) ; Belgian Federal Science Policy Office (BELSPO) via the PRODEX Programme of ESA ; Belgian Federal Science Policy Office (BELSPO) via the PRODEX Programme of ESA ; STFC Ernest Rutherford Fellowship ; STFC Ernest Rutherford Fellowship ; NASA ; NASA ; ESA ; ESA ; University of Liege ; University of Liege ; STFC Consolidated Grant ; STFC Consolidated Grant ; European Union ; European Union ; STFC Consolidated Grants ; STFC Consolidated Grants ; Belgian Fund for Scientific Research (FNRS) ; Belgian Fund for Scientific Research (FNRS) ; Belgian Federal Science Policy Office (BELSPO) via the PRODEX Programme of ESA ; Belgian Federal Science Policy Office (BELSPO) via the PRODEX Programme of ESA ; STFC Ernest Rutherford Fellowship ; STFC Ernest Rutherford Fellowship ; NASA ; NASA ; ESA ; ESA ; University of Liege ; University of Liege ; STFC Consolidated Grant ; STFC Consolidated Grant ; European Union ; European Union ; STFC Consolidated Grants ; STFC Consolidated Grants ; Belgian Fund for Scientific Research (FNRS) ; Belgian Fund for Scientific Research (FNRS) ; Belgian Federal Science Policy Office (BELSPO) via the PRODEX Programme of ESA ; Belgian Federal Science Policy Office (BELSPO) via the PRODEX Programme of ESA ; STFC Ernest Rutherford Fellowship ; STFC Ernest Rutherford Fellowship ; NASA ; NASA ; ESA ; ESA ; University of Liege ; University of Liege ; STFC Consolidated Grant ; STFC Consolidated Grant ; European Union ; European Union ; STFC Consolidated Grants ; STFC Consolidated Grants ; Belgian Fund for Scientific Research (FNRS) ; Belgian Fund for Scientific Research (FNRS) ; Belgian Federal Science Policy Office (BELSPO) via the PRODEX Programme of ESA ; Belgian Federal Science Policy Office (BELSPO) via the PRODEX Programme of ESA ; STFC Ernest Rutherford Fellowship ; STFC Ernest Rutherford Fellowship ; NASA ; NASA ; ESA ; ESA ; University of Liege ; University of Liege ; STFC Consolidated Grant ; STFC Consolidated Grant
源URL[http://ir.iggcas.ac.cn/handle/132A11/89613]  
专题地质与地球物理研究所_其他部门
通讯作者Yao, Z. H.
作者单位1.Univ Liege, Space Sci Technol & Astrophys Res Inst, Lab Phys Atmospher & Planetaire, Liege, Belgium
2.Univ Lancaster, Dept Phys, Lancaster, England
3.Acad Athens, Off Space Res & Technol, Athens, Greece
4.Natl Observ Athens, Inst Astron Astrophys Space Applicat & Remote Sen, Athens, Greece
5.UCL Mullard Space Sci Lab, Dorking, Surrey, England
6.Max Planck Inst Solar Syst Res, Gottingen, Germany
7.Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
8.Univ Alaska Fairbanks, Inst Geophys, Fairbanks, AK 99775 USA
9.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
10.Peking Univ, Sch Earth & Space Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Yao, Z. H.,Radioti, A.,Grodent, D.,et al. Recurrent Magnetic Dipolarization at Saturn: Revealed by Cassini[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2018,123(10):8502-8517.
APA Yao, Z. H..,Radioti, A..,Grodent, D..,Ray, L. C..,Palmaerts, B..,...&Dougherty, M. K..(2018).Recurrent Magnetic Dipolarization at Saturn: Revealed by Cassini.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,123(10),8502-8517.
MLA Yao, Z. H.,et al."Recurrent Magnetic Dipolarization at Saturn: Revealed by Cassini".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 123.10(2018):8502-8517.

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来源：地质与地球物理研究所

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