Response of Electric Field in Terrestrial Magnetosphere to Interplanetary Shock
Response of Electric Field in Terrestrial Magnetosphere to Interplanetary Shock
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DOI：
10.3847/1538-4357/ac90cc
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发表时间：
2022-10
期刊：
影响因子：
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通讯作者：
Dianjun Zhang;Wenlong Liu;J. Du;Yiqun Yu;Xinlin Li;T. Sarris;Jinbin Cao
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文献类型：
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作者：
Dianjun Zhang;Wenlong Liu;J. Du;Yiqun Yu;Xinlin Li;T. Sarris;Jinbin Cao
行星际冲击产生的电场脉冲可以在地球磁层中引起一系列动态过程，之前可以通过快模波传播或与磁层顶压缩相关的流动来解释。基于空间天气模型框架的模拟，我们提出了一种新的场景，其中脉冲的演化是由于快模波的传播和磁层顶的压缩造成的，这可以解释之前相关研究中的模拟和观测结果。电场脉冲的开始由磁层中快模波的传播决定，而脉冲峰值由磁层顶压缩的传播决定。对脉冲的新理解对于通过快速模式与阿尔文波和场线谐振以及相关辐射带电子加速的耦合产生后续超低频波非常重要。
Electric field impulses generated by interplanetary shocks can cause a series of dynamic processes in the Earth’s magnetosphere and were previously explained by either fast-mode wave propagation or flow related to compression of the magnetopause. Based on a Space Weather Modeling Framework simulation, we suggest a new scenario in which the evolution of the impulse is due to both the propagation of the fast-mode wave and the compression of the magnetopause, which can explain the simulation and observations in previous related studies. The onset of the electric field impulse is determined by the propagation of the fast-mode wave in the magnetosphere while the peak of the impulse is determined by the propagation of the compression of the magnetopause. The new understanding of the impulse is important for the generation of subsequent ultralow frequency waves through the coupling of the fast-mode to Alfvén waves and field line resonances and related radiation-belt electron acceleration.