Earthward electric field in the magnetotail: Cluster observations and theoretical estimates

被引：35
|
作者：
Zelenyi, L. M. [1 ]
Artemyev, A. V. [1 ]
Petrukovich, A. A. [1 ]
机构：
[1] Russian Acad Sci, Space Res Inst, Moscow 117810, Russia
来源：
GEOPHYSICAL RESEARCH LETTERS | 2010年 / 37卷
基金：
俄罗斯基础研究基金会;
关键词：
THIN CURRENT SHEETS; ANALYTICAL-MODELS; TAIL;
D O I：
10.1029/2009GL042099
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
In this paper we present an experimental evidence of the existence of the earthward electric field in the thin current sheet of the Earth magnetotail. This field plays an essential role in the redistribution of observed intensities of cross - tail proton and electron currents. We consider the statistics of 59 thin current sheet crossings observed by CLUSTER spacecraft. It is shown that the sum of electron diamagnetic and curvature drifts can explain less than a half of the value of electron bulk velocity. The remaining part of electron velocity is thus related to the E-x x B-z cross field drift. The measurements of the typically negative shift of the central part of proton velocity distribution also confirm the existence of positive Ex field. Finally we suggest the mechanism of Ex formation in the thin current sheet of the Earth magnetotail. Citation: Zelenyi, L. M., A. V. Artemyev, and A. A. Petrukovich (2010), Earthward electric field in the magnetotail: Cluster observations and theoretical estimates, Geophys. Res. Lett., 37, L06105, doi: 10.1029/2009GL042099.
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页数：4
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