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Observations of kinetic Alfven waves by THEMIS near a substorm onset
Duan SuPing; Liu ZhenXing; Angelopoulos, Vassilis; Duan, SP (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China.
Department空间科学部
Source PublicationCHINESE SCIENCE BULLETIN
2012
Volume57Issue:12Pages:1429-1435
ISSN1001-6538
Language英语
KeywordKinetic Alfven Wave Near-earth Plasma Sheet Substorm Onset
AbstractLow 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.; 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.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/3304
Collection空间科学部
Corresponding AuthorDuan, SP (reprint author), Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Duan SuPing,Liu ZhenXing,Angelopoulos, Vassilis,et al. Observations of kinetic Alfven waves by THEMIS near a substorm onset[J]. CHINESE SCIENCE BULLETIN,2012,57(12):1429-1435.
APA Duan SuPing,Liu ZhenXing,Angelopoulos, Vassilis,&Duan, SP .(2012).Observations of kinetic Alfven waves by THEMIS near a substorm onset.CHINESE SCIENCE BULLETIN,57(12),1429-1435.
MLA Duan SuPing,et al."Observations of kinetic Alfven waves by THEMIS near a substorm onset".CHINESE SCIENCE BULLETIN 57.12(2012):1429-1435.
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