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宁静期间双峰电流片的观测研究
Alternative TitleCluster observation and analysis of bifurcated current sheet structure in a quiet time
汤朝灵; 路立; 李中元; 北京8701信箱
Department空间天气学国家重点实验室
Source Publication地球物理学报
2007
Volume50Issue:4Pages:979-985
ISSN0001-5733
Language中文
Keyword双峰电流片 cluster观测 timing分析 磁尾 等离子体不稳定性
Abstract2001年8月19日2011-2030UT,AE指数相对较小(40-130nT),Cluster卫星穿越磁尾电流片.利用Cluster观测资料分析,发现宁静期间有双峰电流片存在,这期间没有明显的高速流,没有明显的电流片振荡.同时,进一步分析双峰电流片中的离子特性发现:质子数密度Np在中性线(=0)附近相对较大,呈非对称性分布;质子温度分布比较均匀;在中性线两侧,质子Y方向上的流速Vy方向相反.最后讨论LHDI(低混杂漂移不稳定性)的非线性演化可能是形成宁静期间双峰电流片的主要机制.这些对进一步完善电流片形成机制可能有很重要的意义.
Other AbstractWe analyse the vertical structure of the magnetotail current sheet within 2011-2030 UT on 19 August 2001,during which the Cluster spacecrafts crossed the current sheet in a quiet time. In the intervals ,the current sheet moved slowly,and the value of the AE index was relatively small,about 40-130 nT.In the quiet time, without fast plasma flow and without significant flapping motion,we also directly observed the bifurcated current sheet.Ion density,velocity and temperature,measured by Cluster spacecrafts in the current sheet during 2011-2030 UT 19 August 2001 are discussed.It is shown that ion density was comparatively bigger near the neutral line,presented non2symmetric distribution,but the distribution of temperature was uniform. And it is observed that in the y direction , the proton bulk velocity is opposite on the both sides of the neutral line. Finally we discuss a possible mechanism for the bifurcated current sheet in a quiet time,which is nonlinear evolution of the lower2hybrid drift instability in the current sheet.These may be important for perfecting the formation mechanism of current sheet bifurcation.
Indexed ByCSCD
Funding Project中国科学院空间科学与应用研究中心
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1408
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
汤朝灵,路立,李中元,等. 宁静期间双峰电流片的观测研究[J]. 地球物理学报,2007,50(4):979-985.
APA 汤朝灵,路立,李中元,&北京8701信箱.(2007).宁静期间双峰电流片的观测研究.地球物理学报,50(4),979-985.
MLA 汤朝灵,et al."宁静期间双峰电流片的观测研究".地球物理学报 50.4(2007):979-985.
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