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第十二届全国日地空间物理学术讨论会

作者： w.baumjohann Space Research Institute Austrian Academy of SciencesGrazAustria

we statistical analyzed the earthward high-speed flow in the near-Earth region explored by TC-1. From June 1,2004 to October 31,2006,a total 94 convective flow burst events are observed by the TC-1 satellite in the ne... 详细信息

关键词： BBF near-Earth AE index substorm onset

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Reconstruction of flux transfer events from Cluster data

Reconstruction of flux transfer events from Cluster data

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第十一届全国日地空间物理学术讨论会

作者： R.Nakamura w.baumjohann A.Balogh H.Reme Space Research Institute Austrian Academy of Sciences A-8042 Graz Austria Space Research Institute Austrian Academy of Sciences A-8042 Graz Austria The Blackett Laboratory Imperial College Prince Consort Road London SW7 2BZ United Kingdom Centre d’Etude Spatiale des Rayonnements F-31028 Toulouse Cedex 4 France

＜正＞The structure of flux transfer events （FTEs）, encountered by the Cluster satellites is visualized using the reconstruction technique. The method produces a map of the FTE cross section by using combined magnetic field and plasma data from all four spacecraft, under the assumptions that the structures are two-dimensional and time-independent. The orientation of the flux rope axis can be fairly well determined through a process of optimizing the map. The result has been compared with those from various single-spacecraft methods, and the nature of magnetopause reconnection leading to those FTEs is discussed.

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Multi-scale analysis of turbulence in the Earth’s Plasma sheet

Multi-scale analysis of turbulence in the Earth’s Plasma sh...

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第十一届全国日地空间物理学术讨论会

作者： R.Nakamura w.baumjohann A.Balogh N.Cornilleau-wehrlin Space Research Institute Austrian Academy of Sciences A-8042 Graz Austria Space Research Institute Austrian Academy of Sciences A-8042 Graz Austria The Blackett Laboratory Imperial College Prince Consort Road London SW7 2BZ United Kingdom CETP 10/12 Avenue de L’Europe F-78140 Velizy France

＜正＞During the last decade significant progress has been made in understanding MHD turbulence in the Earth’s plasma sheet. The four point measurements available from the Cluster mission enable spatiotemporal effects in data sets to be resolved. One application of these multipoint measurements is the determination of the wave vectors and hence the identification of wave modes that exist within the plasma. Fourier and wavelet analysis is used to describe the spectral index and scaling indices of the turbulence for different frequency regions. we study the characteristics and properties the wave, their nature, their relationship with reconnection. we investigate multi-scale transfer of energy towards dissipation scale, scale-dependent anisotropy characteristics of fluctuations and provide evidence for existence of strong cross-scale coupling during rapid plasma flows. The theoretical implications of these observations will be emphasized since they is not yet a general consensus on the role of waves and turbulence.

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wavy variation of quiet nightside plasma sheet

Wavy variation of quiet nightside plasma sheet

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第十一届全国日地空间物理学术讨论会

作者： A.Petrukovich w.baumjohann R.Nakamura A.Runov A.Baloh. Space Research Institute Moscow Russia Space Research Institute Moscow Russia Space Research Institute Moscow Russia Space Research Institute Moscow Russia Space Research Institute Moscow Russia

＜正＞Cluster observations revealed an abundance of inclined current sheets Magnetic configuration of long period （up to 15 min） wavy motions with significant sheet inclination changes appear to be created by an azi...

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walen and Slow-mode Shock Analyses Applied to fast Flows in the Near-Earth Magnetotail By Cluster and Geotail

Walen and Slow-mode Shock Analyses Applied to fast Flows in ...

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第十一届全国日地空间物理学术讨论会

作者： w.baumjohann H.Matsumoto R.Nakamura H.Kojima A.Balogh H.Reme Space Research Institute Austrian Academy of Sciences A-8042 Graz Austria Research Institute for Sustainable Humanosphere Kyoto University Uji Kyoto 611 -0011 Japan Space Research Institute Austrian Academy of Sciences A-8042 Graz Austria Research Institute for Sustainable Humanosphere Kyoto University Uji Kyoto 611 -0011 Japan The Blackett Laboratory Imperial College Prince Consort Road London SW7 2BZ United Kingdom Centre d’Etude Spatiale des Rayonnements F-31028 Toulouse Cedex 4 France

＜正＞Slow shocks are a key component in theories of reconnection. we show an example of a slow shock in the Cluster dataset, observed in the magnetotail in the vicinity of the tail current sheet with flow direction reverse from earthward to tailward or versa. Here we analyze several such events using Cluster observations from the near-Earth magnetotail. Multi-spacecraft analysis is applied to the observations, leading to a better estimate of the shock normal orientation;normal inflow and outflow speeds are calculated. Initial results suggest that taiward flows are accelerated across Petschek-type slow-mode shocks based on the Rankine-Hugoniot shock jump conditions and the walen relation. Eartward flows, however, tend to fail these tests. A possible explanation may be the obstacle posed by the higher magnetic field pressure of the inner magnetosphere.

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Evidence of transient reconnection in the outflow jet of primary reconnection site

Evidence of transient reconnection in the outflow jet of pri...

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： R.wang R.Nakamura T.Zhang A.Du w.baumjohann Q.Lu A.N.Fazakerley Key Laboratory of Ionospheric Environment Institute of Geology and GeophysicsChinese Academy of Sciences Space Research Institute Austrian Academy of Sciences Department of Geophysics and Planetary Science University of Science and Technology of China

The precise mechanism for the formation of magnetic islands in the magnetotail and the subsequent evolution are still *** investigations have provided the first observational evidence of secondary reconnection in the earthward outflow jet of primary reconnection in the *** secondary reconnection takes place38 c/ω earthward from the primary reconnection site and results in the birth of a magnetic island *** generation mechanism is different from the widely used model of multiple reconnection *** duration of the secondary reconnection was approximate one ion gyration period(5 s).The observations resemble recent numerical simulations where magnetic reconnection could spontaneously and transiently happen in the outflow jet,called secondary reconnection,which was used to explain the formation of the dipolarization ***,another magnetic island moving earthward passed through three satellites *** this chance we find the magnetic island was accelerated towards Earth with an acceleration of about9 km s at — 19 R in the magnetotail.

关键词： Magnetospheric physics(magnetotail plasma sheet)-space plasma physics(magnetic reconnection)

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TC-1卫星在近地磁尾(9～13 R_E)探测到的对流型高速流和场向高速流

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科学通报 2008年第14期53卷 1719-1723页

作者：张灵倩刘振兴马志为 w.baumjohann M.w.Dunlop 王国军王霄 H.Reme C.Carr 中国科学院空间科学与应用技术研究中心浙江大学聚变理论与模拟中心 Space Research Institute Austrian Academy of SciencesGraz68042Austrilia Space Sciences Division Rutherford Appleton LaboratoryChiltonDidcotOxfordshire OX110QXUK Centred'Etude Spatialedes Rayonnements Toulouse Cedex F-78140France Imperial College London SW72BZUK

对2004～2006年期间每年的6～11月(2006年截止到10月),共17个月的TC-1卫星上4s精度的FGM和HIA数据进行了统计分析.统计结果显示:在区域(-14RE 详细信息

对2004～2006年期间每年的6～11月(2006年截止到10月),共17个月的TC-1卫星上4s精度的FGM和HIA数据进行了统计分析.统计结果显示:在区域(-14REws,BBFs)的特性一致,说明有相当数量的BBFs是可以进入近地13RE以内的.由于对流型高速流能够更有效的向近地磁尾输运能量,有可能会对亚暴触发过程产生重要的影响.

关键词：高速流对流型高速流场向高速流爆发性整体高速流

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Radial distribution of magnetic field in earth magnetotail current sheet

Radial distribution of magnetic field in earth magnetotail c...

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Z.J.Rong w.X.wan C.Shen A.A.Petrukovich w.baumjohann M.w.Dunlop Y.C.Zhang Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of Sciences Beijing National Observatory of Space Environment Institute of Geology and GeophysicsChinese Academy of Sciences State Key Laboratory of Space weather Center for Space Science and Applied ResearchChinese Academy of Sciences

Knowing the magnetic field distribution in the magnetotail current sheet(CS) is essential for exploring magnetotail *** this study,using a joint dataset of Cluster/TC-1,the radial profile of the magnetic field in the magnetotail CS with radial distances covering 8while AE > 100 nT for active times)and solar wind parameters are statistically *** new findings demonstrate that,independent of the activity state,the field strength and B component(GSM coordinates) start the monotonic increase prominently as r decreases down to 1.5R,which means the dipole field starts to make a significant contribution from *** least in the surveyed radial range,the B component is found to be weaker in the midnight and dusk sectors than that in the dawn sector,displaying a dawn-dusk *** occurrence rate of negative B in active times also exhibits a similar asymmetric distribution,which implies active dynamics may occur more frequently at midnight and dusk *** comparison with that in quiet intervals,several features can be seen in active times:(1) a local B minimum between10.5wn/dusk flank regions inside rwind parameters revealed that the B component is generally stronger under higher dynamic pressure(P > 5 nPa),which may support the dawn-dusk squeezing effect as presented by Miyashita et al.(2010).The CS B is generally correlated with the interplanetary magnetic field(IMF) B component,and the correlation quality is found to be better with higher penetration coefficient(the ratio of CS B to IMF B) when IMF B is *** implications of the present results are discussed.

关键词： Magnetotail Magnetic structure Current sheet

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Fast tailward flows in the plasma sheet boundary layer during a substorm on 9 March 2008:THEMIS observations

Fast tailward flows in the plasma sheet boundary layer durin...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： R.Nakamura E.V.Panov w.baumjohann M.Volwerk A.Retino B.Zieger V.Angelopoulos K.-H.Glassmeier J.P.McFadden D.Larson Space Research Institute Austrian Academy of Sciences GrazAustria Institute of Geophysics and Planetary Physics University of Califomia Los AngelesCaliforniaUSA Institut fr Geophysik und extraterrestrische Physik Technische Universitt Braunschweig BrunswickGermany Space Science Laboratory University of California BerkeleyCaliforniaUSA

[1]Tailward flows in the plasma sheet boundary layer(PSBL) were observed simultaneously by the five Time History of Events and Macroscale Interactions during Substorms(THEMIS) probes at down-tail distances X.6 to 7.6 R for 0 min during an interval of successive substorm intensification in a storm time on 9 March 2008. The flows first occurred close to Earth and then propagated along the magnetic field lines in the PSBL with a speed of 50-350 km *** show that the occurrence of tailward flows is highly dependent on proximity to the plasma sheet *** speeds occurred in the outer part of the PSBL,while either lower tailward speeds(or even earthward flows) were seen in the inner part of the *** tailward flow occurrence increased during magnetotail stretching and decreased or ceased during magnetic field *** PSBL tailward flows near the Earth can be understood as an outflow of the earthward flows that essentially empty the central plasma *** tailward flows along the field line filled the void left behind by the dipolarization front.

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Statistical Characteristics of Field-Aligned Currents in the Plasma Sheet Boundary Layer

Statistical Characteristics of Field-Aligned Currents in the...

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2020年中国地球科学联合学术年会

作者： Y.Q.Chen M.Y.wu T.L.Zhang Y.S.Huang G.Q.wang R.Nakamura w.baumjohann C.T.Russell B.J.Giles University of Science and Technology of China Harbin Institute of Technology Shenzhen Austrian Academy of Sciences University of California Goddard Space Flight Center

Studying the energy and momentum conversion and transfer is key to fully understand and predict how would the ionosphere and magnetosphere react to the input solar wind and interplanetary magnetic field conditions. Previous Studies show that field-aligned currents(FACs) are significant in transferring the energy and momentum between the magnetosphere and the ionosphere, and the large-scale FACs would show seasonal variations at ionospheric altitudes due to ionospheric conductance. The plasma sheet boundary layer(PSBL) region is important in the magnetotail and nightside ionosphere coupling process.

关键词： Statistical Characteristics of Field-Aligned Currents in the Plasma Sheet Boundary Layer

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