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A statistical analysis of the association between fast plasma flows and Pi2 pulsations

文献类型：期刊论文

作者Hsu, Tung-Shin1,2; McPherron, R. L.1,2; Angelopoulos, Vassilis1,2; Ge, Yasong3; Zhang, Hui4; Russell, Christopher1,2; Chu, Xiangning1,2; Kissinger, Jennifer5
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
出版日期2012-11-28
卷号117
ISSN号2169-9380
DOI10.1029/2012JA018173
文献子类Article
英文摘要What is the energy source for Pi2 pulsations? Some researchers have suggested that Pi2 pulsations are caused by plasma flows. Others have suggested that Pi2s are caused by a plasma instability initiated in the near-Earth region. In this study we use Time History of Events and Macroscale Interactions during Substorms (THEMIS) data to examine the relationship between plasma flows and Pi2s. We first identify plasma flows in the tail and then associate these flows with Pi2s. We find that the overall probability of association is nearly 70%. If we further examine the spatial distribution of association we find that in the near-Earth region (8-15 R-E) 90% of the flows are associated with Pi2s. This suggests either that plasma flow in the tail is the cause of Pi2 on the ground or that both are caused by the same process. More importantly, as the flows approach the Earth, the increasing magnetic field causes the flow speed to decrease, that is, the flows are decelerated. In this process of flow braking, the local magnetic field becomes more dipolar. The region of strongest flow braking corresponds to the region of strongest association between flows and Pi2s (8-15 R-E). The GSM X component of plasma flows become zero at around 8 R-E where the most significant magnetic dipolarization occurs. We also find that most plasma flows are associated with a sudden enhancement of the westward electrojet. These results suggest that plasma flows, Pi2 pulsations, and magnetic field dipolarization are essential components of the substorm expansion onset.
WOS关键词BURSTY BULK FLOWS ; MAGNETOSPHERIC SUBSTORM ; PI-2 PULSATIONS ; LOW LATITUDES ; MAGNETOTAIL ; MECHANISM ; BRAKING ; TRIGGER ; EVENT ; SHEET
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000311843600003
出版者AMER GEOPHYSICAL UNION
资助机构NSF(ATM-1003854 ; NSF(ATM-1003854 ; (NASA-NNX07AG47G) ; (NASA-NNX07AG47G) ; (NASA-NNX07AG16G) ; (NASA-NNX07AG16G) ; (NASA-NNX07AF60G) ; (NASA-NNX07AF60G) ; AGS-0720422) ; AGS-0720422) ; NSF(ATM-1003854 ; NSF(ATM-1003854 ; (NASA-NNX07AG47G) ; (NASA-NNX07AG47G) ; (NASA-NNX07AG16G) ; (NASA-NNX07AG16G) ; (NASA-NNX07AF60G) ; (NASA-NNX07AF60G) ; AGS-0720422) ; AGS-0720422) ; NSF(ATM-1003854 ; NSF(ATM-1003854 ; (NASA-NNX07AG47G) ; (NASA-NNX07AG47G) ; (NASA-NNX07AG16G) ; (NASA-NNX07AG16G) ; (NASA-NNX07AF60G) ; (NASA-NNX07AF60G) ; AGS-0720422) ; AGS-0720422) ; NSF(ATM-1003854 ; NSF(ATM-1003854 ; (NASA-NNX07AG47G) ; (NASA-NNX07AG47G) ; (NASA-NNX07AG16G) ; (NASA-NNX07AG16G) ; (NASA-NNX07AF60G) ; (NASA-NNX07AF60G) ; AGS-0720422) ; AGS-0720422)
源URL[http://ir.iggcas.ac.cn/handle/132A11/84086]  
专题中国科学院地质与地球物理研究所
通讯作者Hsu, Tung-Shin
作者单位1.Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
2.Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USA
3.Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA
4.Chinese Acad Sci, Inst Geol & Geophys, Beijing Natl Observ Space Environm, Beijing, Peoples R China
5.NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
推荐引用方式
GB/T 7714		 Hsu, Tung-Shin,McPherron, R. L.,Angelopoulos, Vassilis,et al. A statistical analysis of the association between fast plasma flows and Pi2 pulsations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2012,117.
APA Hsu, Tung-Shin.,McPherron, R. L..,Angelopoulos, Vassilis.,Ge, Yasong.,Zhang, Hui.,...&Kissinger, Jennifer.(2012).A statistical analysis of the association between fast plasma flows and Pi2 pulsations.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,117.
MLA Hsu, Tung-Shin,et al."A statistical analysis of the association between fast plasma flows and Pi2 pulsations".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 117(2012).

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来源：地质与地球物理研究所

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