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《Chinese Journal of Geophysics》 2009-07
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Study of magnetotail plasma sheet vortices with GS velocity field reconstruction method

TIAN An-Min,ZONG Qiu Gang~*Institute of Space Physics and Applied Technology,Peking University,Beijing 100871,China  
Geotail observed series of plasma vortices in the dawnside magnetotail plasma-sheet at intervals 17:54:36~18:09:00UT and 18:59:00~19:30:00UT on 30 September 2000. The vortices contain hot plasma-sheet plasma as well as cold (T1 keV) sheath-like component. From Geotail data, we reconstructed the two-dimensional (2-D) maps of velocity field, ion number density and ion temperature for these vortices using Grad Shafranov (GS) technique. Combined with analysis of vortex plasma features, our results revealed that: the sense of rotation of the plasma flow is approximately clockwise on the GSM equatorial plane. It has a period of about 6~11 min. The vortices have a scale of about 5000 km×1400 km, and move earthward at the speed of 15~25 km/s. Interaction between vortices will cause enhancement of magnetic field between them. But, this is different from the intense disturbances of magnetic field and velocity caused by Kelvin-Helmholtz (K-H) instability at LLBL. Plasma in vortex has lower mean temperature (T≈4 keV) than that of the plasma sheet plasma (T≈6 keV). However, the distribution of both ion number density and temperature is not uniform in the vortex. Ion density is lower at the inner vortex but higher at the edge of each vortex. Temperature has almost an opposite distribution characteristics with that of density. We believe that the observed vortex events were due to the K-H instability occurred at LLBL and the cold plasma in the vortex may come from the magnetosheath.
【Fund】: 国家自然科学基金重点项目(40831061)资助.
【CateGory Index】: P353
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【Citations】
Chinese Journal Full-text Database 1 Hits
1 MA Yu-Duan 1,2 , CAO Jin-Bin 1, ZHOU Guo-Cheng 1, LIU Zhen-Xin 1, H. Reme 3, I. Dandouras 3 1 Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100080, China 2 Graduate School of the Chinese Academy of Sciences, Beijing 100039, China 3 Centre d'Etude Spatiale des Rayonnements, 31028, Toulouse, France;Multipoint analysis of the temporal scale of bursty bulk flow events during the quiet time of magnetotail[J];Chinese Journal of Geophysics;2005-02
【Co-citations】
Chinese Journal Full-text Database 7 Hits
1 MA Yu-Duan~(1,2),CAO Jin-Bin~1,ZHOU Guo-Cheng~1,LIU Zheng-Xin~1,H.Reme~3,I.Dandouras~31 Center for Space Science and Applied Research,Chinese Academy of Sciences,Beijing 100080,China2 Graduate School of the Chinese Academy of Sciences,Beijing 100039,China3 Centre d'Etude Spatiale des Rayonnements,31028,Toulouse,France;Relation of bursty bulk flows in the magnetotail and substorms[J];Chinese Journal of Geophysics;2006-03
2 MA Yu-Duan~1,CAO Jin-Bin~1,ZHOU Guo-Cheng~1,LIU Zhen-Xing~1,H.Reme~2,I.Dandouras~2,E.Lucek~31 Center for Space Science and Applied Research,Chinese Academy of Sciences,Beijing 100080,China2 Centre d'Etude Spatiale des Rayonnements,31028,Toulouse,France3 Imperial College,London,UK;Multipoint analysis of the rapid convection event[J];Chinese Journal of Geophysics;2007-05
3 WANG Yi,CHEN Chu-Xin CAS Key Laboratory of Basic Plasma Physics School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China;Numerical simulation of radial plasma transport in the saturn's magnetosphere[J];Chinese Journal of Geophysics;2008-03
4 YANG Ya-Fen,CHEN Chu-Xin~*CAS Key Laboratory of Basic Plasma Physics,School of Earth and Space Sciences,University of Science and Technologyof China,Hefei 230026,China;Motion of magnetic flux tube produced by reconnection in Earth's magnetotail[J];Chinese Journal of Geophysics;2009-05
5 WANG Zhi-Qiang~(1,2),CAO Jin-Bin~3 1 State Key Laboratory for Space Weather,Chinese Academy of Sciences,Beijing 100190,China 2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China 3 School of Astronautics,Beijing University of Aeronautics and Astronautics,Beijing 100191,China;ULF waves associated with the periodical high speed flows in magnetotail plasma sheet[J];Chinese Journal of Geophysics;2010-02
6 MA YuDuan1,2,CAO JinBin1,2,REME H 3,DANDOURAS I3,LUCEK E4 & DUNLOP M5 1 School of Astronautics,Beijing University of Aeronautics and Astronautics,Beijing 100191,China;2 State Key Laboratory of Space Weather,CSSAR/CAS,Beijing 100190,China;3 Centre d'Etude Spatiale des Rayonnements,31028 Toulouse,France;4 Blackett Laboratory,Imperial College London,London SW72AZ,UK;5 Rutherford Appleton Laboratory,Oxfordshire,UK;The radial evolution of earthward BBFs during substorm[J];中国科学:地球科学(英文版);2010-10
7 CAO JinBin1 2* WANG ZhiQiang2 3 MA YuDuan1 & CAI CunLin2 1 Space Science Institute School of Astronautics Beihang University Beijing 100191 China; 2 Key Laboratory for Space Weather/CSSAR Beijing 100190 China; 3 Graduate University Chinese Academy of Sciences Beijing 100080 China;Differences between onset times of bursty bulk flows (BBFs) of two Cluster satellites in the magnetotail[J];中国科学:技术科学(英文版);2012-05
【Secondary Citations】
Chinese Journal Full-text Database 1 Hits
1 ZHOU Guocheng CAI Chunlin Henri REME Andre BALOGH CAO Jinbin WANG Deju(Center for Space Science and Applied Research, The Chinese Academy of Sciences, Beijing 100080)(Centre d'Etude Spatiale des Rayonnements, France) (The Blachett Laboratory, Imperial College, Landon, U. K.);QUASI-COLLISIONLESS MAGNETIC RECONNECTION EVENTS IN THE NEAR-EARTH MAGNETOTAIL[J];Chinese Journal of Space Science;2003-01
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