Characteristics of the double layer associated with terrestrial bow shock by THEMIS observation

被引：1

作者：

Li ShiYou ^{[1
,2
]}

Zhang ShiFeng ^{[1
]}

Cai Hong ^{[1
]}

Bai XiBin ^{[1
]}

Xie QiuHong ^{[3
]}

机构：

[1] Natl Univ Def Technol, Coll Aerosp Sci & Engn, Changsha 410073, Hunan, Peoples R China

[2] Chinese Peoples Liberat Army, Unit 75171, Guilin 541005, Peoples R China

[3] Chinese Peoples Liberat Army, Unit 75707, Nanning 530021, Peoples R China

来源：

SCIENCE CHINA-EARTH SCIENCES | 2015年 / 58卷 / 04期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

bow shock; double layer; electron hole; current-carrying plasma; PARALLEL ELECTRIC-FIELDS; ELECTROSTATIC SOLITARY WAVES; DOWNWARD CURRENT REGION; PARTICLE-ACCELERATION; DRIVEN; SIMULATIONS; INSTRUMENT; FEATURES; AURORA; HOLES;

D O I：

10.1007/s11430-014-5040-z

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

This study presents observation and detailed analysis on the double layers (DLs) in the ramp and the foreshock contacting with the foot of the terrestrial bow shock by THEMIS on September 14, 2008 under enhanced dynamic pressure in the solar wind. The results reveal that: (1) The time duration of the double layers is mainly 3-8 ms, and their max parallel electric field is minus 10-40 mV/m. (2) On assuming a propagation speed at the ion acoustic speed (gv (s)), their spatial scale is estimated to be 0.3-1.15 km (about 75-200 lambda (D) ). (3) The net potential drop of DLs is estimated to be 5-32 V. (4) The DLs in the ramp and the foreshock contacting to the foot of the bow shock is current-carrying as a result of development and evolution of nonlinear phase of instability in the self-consistent current-carrying plasma. The DLs may play an important role in strong turbulence in the foreshock contacting with the foot of the bow shock.

引用

页码：562 / 572

页数：11

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