Observations of kinetic Alfven waves by THEMIS near a substorm onset

被引：20

作者：

Duan SuPing ^{[1
]}

Liu ZhenXing ^{[1
]}

Angelopoulos, Vassilis ^{[2
]}

机构：

[1] Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China

[2] Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA

来源：

CHINESE SCIENCE BULLETIN | 2012年 / 57卷 / 12期

基金：

中国国家自然科学基金;

关键词：

kinetic Alfven wave; near-Earth plasma sheet; substorm onset; EARTH PLASMA SHEET; CURRENT DISRUPTION; TRANSPORT; MAGNETOPAUSE;

D O I：

10.1007/s11434-012-4973-x

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Low frequency electromagnetic fluctuations in the vicinity of a magnetospheric substorm onset were investigated using simultaneous observations by THEMIS multiple probes in the near-Earth plasma sheet in the magnetotail. The observations indicate that in the vicinity of a substorm onset, kinetic Alfven waves can be excited in the high-beta plasma sheet (beta=2 mu(0)nT/B-2, the ratio of plasma thermal pressure to magnetic pressure) within the near-Earth magnetotail. The kinetic Alfven wave has a small spatial scale in the high-beta plasma. The parallel electric field accompanying kinetic Alfven waves accelerates the charged particles along the magnetic field. The kinetic Alfven waves play an important role in the substorm trigger process, and possibly in the formation of a substorm current wedge.

引用

页码：1429 / 1435

页数：7

共 24 条

[1]

Angelopoulos V, 2008, SPACE SCI REV, V141, P5, DOI 10.1007/s11214-008-9336-1

[2] Neutral line model of substorms: Past results and present view [J].