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  4. 中国科学院地球与行星物理重点实验室
A physical explanation for the magnetic decrease ahead of dipolarization fronts

文献类型：期刊论文

作者Yao, Z. H.1; Liu, J.2; Owen, C. J.1; Forsyth, C.1; Rae, I. J.1; Pu, Z. Y.3; Fu, H. S.4; Zhou, X. -Z.3; Shi, Q. Q.5; Du, A. M.6
刊名ANNALES GEOPHYSICAE
出版日期2015
卷号33期号:10页码:1301-1309
关键词Magnetospheric physics current systems magnetotail plasma sheet
DOI10.5194/angeo-33-1301-2015
文献子类Article
英文摘要Recent studies have shown that the ambient plasma in the near-Earth magnetotail can be compressed by the arrival of a dipolarization front (DF). In this paper we study the variations in the characteristics of currents flowing in this compressed region ahead of the DF, particularly the changes in the cross-tail current, using observations from the THEMIS satellites. Since we do not know whether the changes in the cross-tail current lead to a field-aligned current formation or just form a current loop in the magnetosphere, we thus use redistribution to represent these changes of local current density. We found that (1) the redistribution of the cross-tail current is a common feature preceding DFs; (2) the redistribution of cross-tail current is caused by plasma pressure gradient ahead of the DF and (3) the resultant net current redistributed by a DF is an order of magnitude smaller than the typical total current associated with a moderate substorm current wedge (SCW). Moreover, our results also suggest that the redistributed current ahead of the DF is closed by currents on the DF itself, forming a closed current loop around peaks in plasma pressure, what is traditionally referred to as a banana current.
WOS关键词SUBSTORM CURRENT WEDGE ; CENTRAL PLASMA SHEET ; BURSTY BULK FLOWS ; CURRENT DISRUPTION ; FLUX TRANSPORT ; MAGNETOTAIL ; EARTH ; TAIL ; SIMULATIONS ; EVOLUTION
WOS研究方向Astronomy & Astrophysics ; Geology ; Meteorology & Atmospheric Sciences
语种英语
WOS记录号WOS:000364322200009
资助机构UK Science and Technology Facilities Council (STFC) grant at UCL/MSSL(ST/L005638/1) ; UK Science and Technology Facilities Council (STFC) grant at UCL/MSSL(ST/L005638/1) ; STFC grant(ST/L000563/1) ; STFC grant(ST/L000563/1) ; National Environmental Research Council (NERC) grant(NE/L007495/1 ; National Environmental Research Council (NERC) grant(NE/L007495/1 ; NERC grant(NE/L007495/1 ; NERC grant(NE/L007495/1 ; NASA(NAS5-02099 ; NASA(NAS5-02099 ; German Ministry for Economy and Technology ; German Ministry for Economy and Technology ; German Center for Aviation and Space (DLR)(50 OC 0302) ; German Center for Aviation and Space (DLR)(50 OC 0302) ; NE/M00886X/1) ; NE/M00886X/1) ; NE/M00886X/1) ; NE/M00886X/1) ; NNX14AC17G) ; NNX14AC17G) ; UK Science and Technology Facilities Council (STFC) grant at UCL/MSSL(ST/L005638/1) ; UK Science and Technology Facilities Council (STFC) grant at UCL/MSSL(ST/L005638/1) ; STFC grant(ST/L000563/1) ; STFC grant(ST/L000563/1) ; National Environmental Research Council (NERC) grant(NE/L007495/1 ; National Environmental Research Council (NERC) grant(NE/L007495/1 ; NERC grant(NE/L007495/1 ; NERC grant(NE/L007495/1 ; NASA(NAS5-02099 ; NASA(NAS5-02099 ; German Ministry for Economy and Technology ; German Ministry for Economy and Technology ; German Center for Aviation and Space (DLR)(50 OC 0302) ; German Center for Aviation and Space (DLR)(50 OC 0302) ; NE/M00886X/1) ; NE/M00886X/1) ; NE/M00886X/1) ; NE/M00886X/1) ; NNX14AC17G) ; NNX14AC17G)
源URL[http://ir.iggcas.ac.cn/handle/132A11/62175]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
作者单位1.UCL Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England
2.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA
3.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
4.Beihang Univ, Sch Astronaut, Space Sci Inst, Beijing 100191, Peoples R China
5.Shandong Univ, Sch Space Sci & Phys, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Yao, Z. H.,Liu, J.,Owen, C. J.,et al. A physical explanation for the magnetic decrease ahead of dipolarization fronts[J]. ANNALES GEOPHYSICAE,2015,33(10):1301-1309.
APA Yao, Z. H..,Liu, J..,Owen, C. J..,Forsyth, C..,Rae, I. J..,...&Chu, X. N..(2015).A physical explanation for the magnetic decrease ahead of dipolarization fronts.ANNALES GEOPHYSICAE,33(10),1301-1309.
MLA Yao, Z. H.,et al."A physical explanation for the magnetic decrease ahead of dipolarization fronts".ANNALES GEOPHYSICAE 33.10(2015):1301-1309.

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来源：地质与地球物理研究所

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