...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth, planets and space: EPS >Shear-driven kinetic Alfven wave in the plasma sheet boundary layer
【24h】

Shear-driven kinetic Alfven wave in the plasma sheet boundary layer

机译：等离子体板边界层中的剪切驱动动力学阿尔夫文波

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Shear-driven kinetic Alfven waves (KAWs) at the plasma sheet boundary layer (PSBL) were investigated for substorm events in the presence of a parallel electric field using the general loss-cone distribution function. Using a kinetic approach, we derived the expressions for dispersion relation and growth length of the KAW in the presence of the parallel electric field using the general loss-cone distribution function for both, weak and strong shear regimes. The frequency of the KAW obtained is in agreement with observed values of 0.1-4 Hz in the PSBL. The results explain the generation of the energetic KAWs at the PSBL by the shear at substorm onset. The parallel electric field associated with the energetic KAWs at substorm onset may heat the field-aligned electrons, leading to parallel electron energisation that ultimately causes an intense aurora. The electric field along magnetic field lines enhances the frequency of KAW but decreases the growth length in the case of weak shear. We also found that the parallel electric field can reflect KAW towards the PSBL. The loss-cone distribution index changes the profiles of frequency and growth length plots of the shear-driven KAW. Hence, the loss-cone distribution function is an important factor in the excitation of KAW in the active region of the magnetosphere, such as the PSBL and the auroral acceleration region.
机译：使用一般的损失锥分布函数，研究了在平行电场存在下，等离子体板边界层（PSBL）上的剪切驱动动力学Alfven波（KAW）的亚暴事件。使用动力学方法，我们使用弱和强剪切两种情况下的一般损耗圆锥分布函数，得出了在平行电场存在下，KAW的色散关系和生长长度的表达式。所获得的KAW的频率与在PSBL中观察到的0.1-4Hz的值一致。结果解释了亚暴爆发时剪切带在PSBL上产生的高能KAW。在亚暴爆发时，与高能KAW相关的平行电场可能会加热场对准的电子，从而导致平行电子激发，最终导致强烈的极光。沿磁场线的电场会增加KAW的频率，但在弱剪切的情况下会减小生长长度。我们还发现，平行电场可以将KAW反射到PSBL。损失圆锥分布指数会改变剪切驱动的KAW的频率和生长长度图的轮廓。因此，损失圆锥分布函数是在磁层有效区域（如PSBL和极光加速区域）中激发KAW的重要因素。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

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