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Review of Mercury's dynamic magnetosphere:Post-MESSENGER era and comparative magnetospheres

Science China Earth Sciences 2022年第1期65卷 25-74页

作者： Weijie SUN Ryan MDEWEY Sae AIZAWA Jia HUANG James A.SLAVIN Suiyan FU Yong WEI Charles F.BOWERS Department of Climate and Space Sciences and Engineering University of MichiganAnn ArborMl 48109USA Institut de Recherche en Astrophysique et Planetologie CNRS-UPS-CNESToulouse 31400France Department of Geophysics Graduate School of ScienceTohoku UniversitySendai 980-8578Japan School of Earth and Space Sciences Peking UniversityBeijing 100871China Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China School of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100864China

This review paper summarizes the research of Mercury’s magnetosphere in the Post-MESSENGER era and compares its dynamics to those in other planetary magnetospheres,especially to those in Earth’s *** review starts by introducing the planet Mercury,including its interplanetary environment,magnetosphere,exosphere,and conducting *** frequent and intense magnetic reconnection on the dayside magnetopause,which is represented by the flux transfer event"shower",is reviewed on how they depend on magnetosheath plasma β and magnetic shear angle across the magnetopause,followed by how it contributes to the flux circulation and magnetosphere-surface-exosphere *** the next,Mercury’s magnetosphere under extreme solar events,including the core induction and the reconnection erosion on the dayside magnetosphere,as well as the responses of the nightside magnetosphere,are ***,the dawn-dusk properties of the plasma sheet,including the features of the ions,the structure of the current sheet,and the dynamics of magnetic reconnection,are *** last topic is devoted to the particle energization in Mercury’s magnetosphere,which includes the energization of the Kelvin-Helmholtz waves on the magnetopause boundaries,reconnection-generated magnetic structures,and the cross-tail electric *** each chapter,the last section discusses the open questions related to each topic,which can be considered by the simulations and the future spacecraft *** end this paper by summarizing the future Bepi Colombo opportunities,which is a joint mission of ESA and JAXA and is en route to Mercury.

关键词： Mercury’s magnetosphere Flux transfer event shower Extreme solar events Core induction Reconnection erosion dawn-dusk asymmetry Substorm current wedge Particle energization Kelvin-Helmholtz wave

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Statistical study of magnetotail flux ropes near the lunar orbit

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Science China(Technological Sciences) 2016年第10期59卷 1591-1596页

作者： ZHAO Si Qi TIAN An Min SHI Quan Qi XIAO Chi Jie FU Sui Yan ZONG Qiu Gang WANG Hui Zi ZHANG Shuai ZHAO Shao Jie PAN Dong Xiao TENG Shang Chun LIU Yi Xing TAN Kun Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment School of Space Science and PhysicsShandong University School of Physics Peking University School of Earth and Space Science Peking University

Flux-rope/TCR events near the magnetotail lunar orbit （-67RE 〈 GSM X＊〈 -39RE） were studied using magnetic-field and plasma data measured by THEMIS B and C between January 2011 and March 2012. The aberrant coordinate GSM＊, where the X＊ axis is rotated 4° relative to GSM-X, was used to count the occurrence rate. The number ratio of earthward to tailward events was about 3：5. Moreover, the event occurrence rate distribution showed a clear dawn-dusk asymmetry distribution, with dusk-side events accounting for 57.98%. A superposed epoch analysis of the flux-rope events showed that earthward events had a shorter duration in the leading than in the trailing part. Earthward events also displayed a lower temperature and a lower flow speed than tailward events. We studied the relationship between the event occurrence rate and geomagnetic activity level even further. The occurrence rate of tailward flux-rope/TCR events increases with increasing AE-index, whereas earthward events occur mainly in the relatively quiet period of geomagnetic activity （AE - 100-300 nT）. Flux-rope/TCR events identi- fied within a 10 mm time frame were treated as belonging to a single reconnection event. By comparing the occurrence rates of earthward and tailward events along X＊, we estimated the most likely location of the near-Earth reconnection site as X＊ = -36RE.

关键词： magnetotail flux rope TCR dawn-dusk asymmetry reconnection site

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Statistical survey on the magnetic field in magnetotail current sheets:Cluster observations

Statistical survey on the magnetic field in magnetotail curr...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： LUCEK E BALOGH A College of Earth Science Graduate University of Chinese Academy of Sciences Imperial College London SW7 2AZUnited Kingdom

The distribution properties of the magnetic field in magnetotail current sheets have been explored statistically with the magnetic measurement data of the Cluster mission from June to November of the years *** is found that,on average,the strength of the magnetic field and its B component in the current sheet are weaker in the region close to midnight but stronger near the dawnside and duskside flanks,which implies that,in general,a thinner current sheet occurs near midnight and thicker ones near both *** occurrence of tail current sheet flapping is higher on both flanks than in the midnight region,although it is most frequent in the dawn *** sheets with a negative B component or a strong B component have a higher probability of occurring at magnetic local times of 21:00-01:00,indicating that magnetic activity,*** reconnection and current disruption occur more frequently ***,the probability distributions of the B component and the tilt angle of magnetic field lines in the current sheet are approximately normal distributions,and the occurrence probability of the flattened current sheet is about one third that of the normal current *** magnetic field and B component in the current sheet mainly vary from 1 nT to 10 *** B component in the tail central current sheet is on average twice the IMF B at 1 AU.

关键词： magnetosphere magnetic field magnetotail current sheet neutral sheet dawn-dusk asymmetry

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Ground magnetic characteristics of the storm-time ring current asymmetry

Ground magnetic characteristics of the storm-time ring curre...

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中国科学院地质与地球物理研究所2008学术年会

作者： WU YingYan~(1+),XU WenYao~1,CHEN GengXiong~1,CHEN Bo~(1,2) & LIU XiaoCan~(1,2) 1 Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 2 Graduate University of Chinese Academy of Sciences,Beijing 100049,China

Using the minute data of the H component of geomagnetic field from the 20°E magnetic meridian chain and the 30°N magnetic latitudinal chain,the temporal evolution characteristics of the equatorial ring current during the storm on November 7—10,2004 are *** is indicated that the UT-MLT and UT-MLAT graphics extremely exhibit the local time distribution,latitudinal variation and temporal evolution of the H *** results show:(1)The UT-MLT contour clearly shows the increasing of the H component mostly around noon during the initial phase,representing the geomagnetic effect from the magnetopause current *** the main phase,most negative values of the H component appear around the dusk-side,indicating the dawn-dusk asymmetric distribution of the ring current. (2)The contour of UT-MLAT suggests the latitudinal variation of the H component decreasing with the enhancement of the latitudes during geomagnetic storm,which is in good agreement with the D *** latitudinal variations provide a new sight for describing the temporal characteristics of the intensity of the storm-time ring current.(3)Both the contours of UT-MLT and UT-MLAT are useful to monitor the space-time distribution of the equatorial ring current.

关键词： geomagnetic storm ring current dawn-dusk asymmetry latitudinal variation

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