Propagation of interplanetary shock excited ultra low frequency (ULF) waves in magnetosphere-ionosphere-atmosphere—Multi-spacecraft “Cluster” and ground-based magnetometer observations
Propagation of interplanetary shock excited ultra low frequency (ULF) waves in magnetosphere-ionosphere-atmosphere—Multi-spacecraft “Cluster” and ground-based magnetometer observations
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DOI：
10.1007/s11431-010-4064-7
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发表时间：
2010-08
期刊：
影响因子：
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通讯作者：
Chengrui Wang;Q. Zong;YongFu Wang
中科院分区：
文献类型：
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作者：
Chengrui Wang;Q. Zong;YongFu Wang
磁层中的超低频（ULF）波可以作为太阳风能量向内传输的重要手段。本文定量分析了行星际激波触发的超低频波从磁层赤道面内沿着磁力线传播到电离层顶及电离层以下的传播过程，建立了一个比较完整的磁层-电离层-电离层模型，建立了一个大气传播模型，用于研究行星际激波触发的超低频波振幅与大气传播的关系磁层空间中的超低频电磁波和超低频电磁波引起的磁效应。通过与近期观测结果的比较发现：在2004年11月7日行星际激波与磁层相互作用的事件中，Cluster卫星观测到的电场起伏与地面站经带通滤波后的纬向分量具有相似的特征。与足迹附近的地磁测量结果对比发现，磁层中的电场扰动以超低频波的形式沿着地面磁力线传播，并转化为地磁扰动。结果表明，超低频波与地面地磁观测有一定的联系。超低频波与电离层中的电离成分耦合，以电磁波的形式传播到地面。在本研究中，我们认为行星际激波引起的磁层、电离层和地磁效应是同一物理现象，在不同的位置响应。在全面考虑行星际激波电磁响应的基础上，发现CLUSTER多星观测与地磁台站观测之间的相关性是由于超低频波在磁层-电离层-大气系统中的传播，并对这一响应过程进行了定量解释。
The ultra low frequency (ULF) wave in magnetosphere can act as an important means for solar wind energy inward transmission. This paper quantitatively analyzes the propagation process of the ULF wave triggered by the interplanetary shock propagating from inner magnetosphere equatorial plane along magnetic field lines to the top of the ionosphere and below ionosphere propagating process and establishes a relatively complete magnetosphere-ionosphere-atmosphere propagation model which can be used to study the relationship between the amplitude of the ULF waves triggered by the interplanetary shock wave in magnetospheric space and the magnetic effect caused by the ULF waves. After a comparison with recent observations, we found that: in the event during November 7, 2004 that an interplanetary shock wave interacted with the magnetosphere, Cluster satellites observed that electric field fluctuations and the band-pass filtered result of ground stations meridional component had similar characteristics. Comparing with the geomagnetic measurement near the footprints, we found that the electric field disturbance in the magnetosphere spread along the ground magnetic field lines in the form of the ULF waves and changed into geomagnetic disturbance. The result reveals that the ULF wave is in contact with the ground geomagnetic observation. The ULF waves couple with ionized components in ionosphere and spread to the ground in the form of electromagnetic waves. In this research, we believe that the magnetosphere, ionosphere and ground magnetic effects caused by interplanetary shock wave are the same physical phenomena responding in different locations. Based on the overall consideration of entire electromagnetic response to the interplanetary shock wave, we found that the correlation between CLUSTER multi-satellite observation and geomagnetic station observation is due to the ULF wave propagated in magnetosphere-ionosphere-atmosphere system, and we quantitatively interpreted this response process.