...
首页> 外文期刊>Annales Geophysicae >Ionospheric conductance distribution and MHD wave structure: observation and model
【24h】

Ionospheric conductance distribution and MHD wave structure: observation and model

机译:电离层电导分布和MHD波结构:观测与模型

获取原文
           

摘要

The ionosphere influences magnetohydrodynamicwaves in the magnetosphere by damping because of Joule heating and by varyingthe wave structure itself. There are different eigenvalues and eigensolutions ofthe three dimensional toroidal wave equation if the height integrated Pedersenconductivity exceeds a critical value, namely the wave conductance of themagnetosphere. As a result a jump in frequency can be observed in ULF pulsationrecords. This effect mainly occurs in regions with gradients in the Pedersenconductances, as in the auroral oval or the dawn and dusk areas. A pulsationevent recorded by the geostationary GOES-6 satellite is presented. We explainthe observed change in frequency as a change in the wave structure whilecrossing the terminator. Furthermore, selected results of numerical simulationsin a dipole magnetosphere with realistic ionospheric conditions are discussed.These are in good agreement with the observational data.Key words. Ionosphere · (Ionosphere · magnetosphereinteractions) · Magnetospheric physics · Magnetosphere · ionosphereinteractions · MHD waves and instabilities.
机译:电离层通过焦耳加热引起的阻尼和改变波结构本身来影响磁层中的磁流体动力学波。如果高度积分Pedersen电导率超过临界值,即对流层的波导,则三维环形波方程的本征值和本征解就不同。结果,可以在ULF脉动记录中观察到频率跳变。这种影响主要发生在彼德森电导具有梯度的区域,如极光椭圆形或黎明和黄昏区域。提出了对地静止GOES-6卫星记录的一次脉动事件。我们解释了观察到的频率变化是越过终结器时波结构的变化。此外,还讨论了在具有实际电离层条件下的偶极磁层的数值模拟结果,这些结果与观测数据非常吻合。 关键词。电离层·(电离层·磁层相互作用) ·磁层物理学·磁层·电离层相互作用·MHD波和不稳定性。

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