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The global structure and time evolution of dayside magnetopause surface eigenmodes

机译:日间磁层顶本征模的整体结构和时间演化

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摘要

Theoretical work and recent observations suggest that the dayside magnetopause may support its own eigenmode, consisting of propagating surface waves which reflect at the northern and southern ionospheres. These magnetopause surface eigenmodes (MSEs) are a potential source of magnetospheric ultralow-frequency (ULF) waves with frequencies less than 2mHz. Here we use the Space Weather Modeling Framework to study the magnetospheric response to impulsive solar wind dynamic pressure increases. Waves with 1.8mHz frequency are excited whose global properties are largely consistent with theoretical predictions for MSE and cannot be explained by other known ULF wave modes. These simulation results lead to two key findings: (1) MSE can be sustained in realistic magnetic field geometries with nonzero flow shear and finite current layer thickness at the magnetopause and (2) MSE can seed the growth of tailward propagating surface waves via the Kelvin-Helmholtz instability.
机译:理论工作和最近的观察表明,日间的磁更年期可能支持其自身的本征模,该本征模由在南北电离层反射的传播表面波组成。这些磁层顶表面本征模式(MSE)是磁层超低频(ULF)波的潜在来源,频率低于2mHz。在这里,我们使用太空天气建模框架来研究磁层对脉冲太阳风动态压力增加的响应。频率为1.8mHz的波被激发,其整体性质与MSE的理论预测基本一致,无法用其他已知的ULF波模式进行解释。这些仿真结果导致两个关键发现:(1)MSE可以在现实的磁场几何条件下维持,并且在磁停顶处具有非零的流量剪切和有限的电流层厚度;(2)MSE可以通过开尔文(Kelvin)播种向后传播的表面波的增长-亥姆霍兹不稳定性。

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