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MMS星座对磁层顶磁通量绳内离子惯性尺度结构的观测

刘杨 MOORE T E RUSSELL C T LINDQVIST P A TORBERT R B POLLOCK C ZHAO Cong 濮祖荫 谢伦 郭瑞龙 王晓钢 肖池阶 史全岐 DUNLOP M BOGDANOVA Y V

空间科学学报2018，Vol.38Issue(2)：147-168,22.
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空间科学学报2018，Vol.38Issue(2)：147-168,22.DOI:10.11728/cjss2018.02.147

MMS星座对磁层顶磁通量绳内离子惯性尺度结构的观测

Ion-scale Structures in Flux Ropes Observed by MMS at the Magnetopause

刘杨 1MOORE T E 2RUSSELL C T 3LINDQVIST P A 4TORBERT R B 5POLLOCK C 2ZHAO Cong 3濮祖荫 1谢伦 1郭瑞龙 6王晓钢 7肖池阶 8史全岐 9DUNLOP M 10BOGDANOVA Y V10

作者信息

  • 1. 北京大学地球与空间科学学院 北京100871
  • 2. Goddard Space Flight Center, NASA, Greenbelt, MD, USA
  • 3. University of California, Los Angeles, CA, USA
  • 4. Royal Institute of Technology, Stockholm, Sweden
  • 5. University of New Hampshire, Durham, NH, USA
  • 6. 中国科学院地质与地球物理研究所 北京100029
  • 7. 哈尔滨工业大学物理系 哈尔滨150001
  • 8. 北京大学物理学院 北京100871
  • 9. 山东大学空间科学与物理学院 威海264209
  • 10. RAL Space, Rutherford Appleton Laboratory, STFC, Didcot, OX11 0QX, UK
  • 折叠

摘要

Abstract

In this paper the structures with scale of ion inertial length (di) in flux ropes at the magnetopause are studied based on MMS measurements.The results show that currents (jm) of di scale are found to exist in many flux ropes with different scales,which flow in the-M direction in magnetopause local coordinates (i.e.,in the same direction of the Chapman-Ferraro current at the magnetopause) and are carried by electrons' motion in the +M direction (vem).Within the current structures,magnetosheath and magnetospheric plasma populations are mixed;the magnetic field has open topology;ions are non-magnetized,while electrons are frozen-in with the magnetic field lines;the N-component of electric field (En),which is Hall electric field in nature,substantially enhances (up to about 20 mV·m-1),accompanying with notable fluctuations.Detailed analysis shows that the current,separation of electrons' motion from ions and the Hall electric field are closely related to each other,and obey the general Ohm's Law.In addition,we have also analyzed the MMS measurements of magnetic reconnection events at the magnetopause.It is found that structures similar to those in flux ropes are also present inside the reconnection region in many cases.Their scales are of di length.The directions (magnitudes) of the Hall electric field EN,current filament jM and electron velocity veM are as same as (close to) those in flux ropes.On the bases of above observations and making use of the classical flux rope models,how the di-scale structures in flux ropes are formed is studied.It is suggested that they are likely to originate from the corresponding structures in the reconnection region at the magnetopause which play an essential role in the formation process of di-scale flux ropes.

关键词

磁通量绳/离子尺度电流/霍尔电场/磁层顶/磁重联

Key words

Magnetic flux ropes/Ion-scale current/Hall electric field/Magnetopause/Magnetic reconnection

分类

天文与地球科学

引用本文复制引用

刘杨,MOORE T E,RUSSELL C T,LINDQVIST P A,TORBERT R B,POLLOCK C,ZHAO Cong,濮祖荫,谢伦,郭瑞龙,王晓钢,肖池阶,史全岐,DUNLOP M,BOGDANOVA Y V..MMS星座对磁层顶磁通量绳内离子惯性尺度结构的观测[J].空间科学学报,2018,38(2):147-168,22.

基金项目

国家自然科学基金项目资助(41274167,41674164) （41274167,41674164）

空间科学学报

OA北大核心CSCDCSTPCD

0254-6124

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