首页> 外文OA文献 >Interplanetary magnetic field control of the ionospheric field-aligned current and convection distributions
【2h】

Interplanetary magnetic field control of the ionospheric field-aligned current and convection distributions

机译:电离层磁场对准的电流和对流分布的行星际磁场控制

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

Patterns of the high-latitude ionospheric convection and field-aligned current (FAC) are a manifestation of the solar wind-magnetosphere-ionosphere coupling. By observing them we can acquire information on magnetopause reconnection, a process through which solar wind energy enters the magnetosphere. We use over 10 years of magnetic field and convection data from the CHAMP satellite and Super Dual Auroral Radar Network radars, respectively, to display combined distributions of the FACs and convection for different interplanetary magnetic field (IMF) orientations and amplitudes. During southward IMF, convection follows the established two-cell pattern with associated Region 1 and Region 2 FACs, indicating subsolar reconnection. During northward IMF, superposed on a weak two-cell pattern there is a reversed two-cell pattern with associated Region 0 and Region 1 FACs on the dayside, indicating lobe reconnection. For dominant IMF Bx, the sign of Bz determines whether lobe or subsolar reconnection signatures will be observed, but Bx will weaken the signatures compared to pure northward or southward IMF. When the IMF rotates from northward to duskward or dawnward, the distinct reversed and forward two-cell patterns start to merge into a distorted two-cell pattern. This is in agreement with the IMF By displacing the reconnection location from the open lobe field lines to closed dawn or dusk field lines, even though IMF Bz>0. As the IMF continues to rotate southward, the distorted pattern transforms smoothly to that of the symmetric two-cell pattern. While the IMF direction determines the configuration of the FACs and convection, the IMF amplitude affects their intensity.
机译:高纬度电离层对流和场定向电流(FAC)的模式是太阳风-磁层-电离层耦合的体现。通过观察它们,我们可以获得有关磁更年期重新连接的信息,该过程是太阳风能进入磁层的过程。我们分别使用了来自CHAMP卫星和超级双极光雷达网络雷达的10多年的磁场和对流数据,以显示不同行星际磁场(IMF)方向和振幅的FAC和对流的组合分布。在向南的IMF期间,对流遵循已建立的带有两个区域1和区域2 FAC的两单元模式,表明太阳下层重新连接。在北向IMF期间,叠加在较弱的两单元模式上的是反向的两单元模式,其白天具有关联的0区和1区FAC,表明叶重新连接。对于占主导地位的IMF Bx,Bz的符号决定了是否会观察到波瓣或太阳下重新连接特征,但是与纯北向或南向IMF相比,Bx会削弱这些特征。当IMF从北向黄昏或黎明旋转时,截然不同的反向和向前两个单元格模式开始合并为扭曲的两个单元格模式。这与IMF一致,即使IMF Bz> 0,也可以将重新连接位置从开放的波瓣场线转移到闭合的黎明或黄昏场线。当IMF继续向南旋转时,扭曲的模式会平滑地转换为对称的两单元模式。当IMF方向确定FAC和对流的配置时,IMF振幅会影响其强度。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号