Statistics of the field-aligned currents at the high-latitude energetic electron boundaries in the nightside: Cluster observation

Jie Ren; Q. G. Zong; X. Z. ZhouHui ZhangS. Y. FuY. F. WangYong C.-M. Liu

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Statistics of the field-aligned currents at the high-latitude energetic electron boundaries in the nightside: Cluster observation

机译：统计field-aligned电流的高纬度地区充满活力的电子边界阴面:集群的观察

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Magnetic field disturbances with a clear bipolar signature are frequently observed when the Cluster spacecraft fleet passes through both southern and northern high-latitude energetic electron boundaries at the nightside magnetosphere. The dominant variation of the bipolar signature is in the azimuthal direction of the local mean field-aligned coordinate, indicating a field-aligned current. From 2001 to 2008, we have examined 110 events with the magnetic field and energetic electron measurements. The main results can be summarized as follows: (1) The density and thickness of the field-aligned current, calculated under the assumption of the one-dimensional sheet, are in order of tens of nA/m2 and hundreds of kilometers, respectively. (2) Currents flowing into and away from the ionosphere tend to be observed in the postmidnight and premidnight sector, respectively, which have the same polarity as the region 1 current system. (3) These currents mainly distribute in the 60°–75° magnetic latitude region after mapping to the ionosphere. We also find that the current density and corresponding magnetic field variation are positively correlated with the Kp index and solar wind pressure, but almost independent of the AE index.

机译：磁场干扰和双相签名时经常观察到集群飞船舰队穿过南部和北部高纬度地区充满活力电子边界在阴面磁气圈。双签名在方位方向当地的意思是field-aligned坐标,表明field-aligned电流。2008年,我们已经检查了110事件磁场和高能电子测量。如下:(1)的密度和厚度field-aligned电流,计算下一维表的假设nA / m2和数以百计的顺序公里,分别。成和远离电离层观察postmidnight和premidnight有相同的部门,分别极性区域1当前系统。这些电流主要分布在60°-75°磁纬地区映射后电离层。和相应的磁场变化与Kp呈正相关指数和太阳能风压,但几乎独立的AE索引。

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来源
《Journal of Geophysical Research, A. Space Physics: JGR》 |2016年第3期|1979-1989|共11页
作者
Jie Ren; Q. G. Zong; X. Z. ZhouHui ZhangS. Y. FuY. F. WangYong C.-M. Liu;
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作者单位

Geophysical Institute, University Alaska Fairbanks, Fairbanks, Alaska, USA;

State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing, China;

Institute of Space Physics and Applied Technology, Peking University, Beijing, China;

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正文语种英语
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关键词
Ae Index; Wing loading; field aligned currentsVariationmagnetic fieldKP index;

机译：Ae指数;翼加载字段一致currentsVariationmagnetic fieldKP指数;

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Statistics of the field-aligned currents at the high-latitude energetic electron boundaries in the nightside: Cluster observation

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