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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Global MHD modeling of resonant ULF waves: Simulations with and without a plasmasphere
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Global MHD modeling of resonant ULF waves: Simulations with and without a plasmasphere

机译：全球共振ULF波的磁流体动力建模:模拟和等离子体层

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摘要

We investigate the plasmaspheric influence on the resonant mode coupling of magnetospheric ultralow frequency (ULF) waves using the Lyon-Fedder-Mobarry (LFM) global magnetohydrodynamic (MHD) model. We present results from two different versions of the model, both driven by the same solar wind conditions: one version that contains a plasmasphere (the LFM coupled to the Rice Convection Model, where the Gallagher plasmasphere model is also included) and another that does not (the stand-alone LFM). We find that the inclusion of a cold, dense plasmasphere has a significant impact on the nature of the simulated ULF waves. For example, the inclusion of a plasmasphere leads to a deeper (more earthward) penetration of the compressional (azimuthal) electric field fluctuations, due to a shift in the location of the wave turning points. Consequently, the locations where the compressional electric field oscillations resonantly couple their energy into local toroidal mode field line resonances also shift earthward. We also find, in both simulations, that higher-frequency compressional (azimuthal) electric field oscillations penetrate deeper than lower frequency oscillations. In addition, the compressional wave mode structure in the simulations is consistent with a radial standing wave oscillation pattern, characteristic of a resonant waveguide. The incorporation of a plasmasphere into the LFM global MHD model represents an advance in the state of the art in regard to ULF wave modeling with such simulations. We offer a brief discussion of the implications for radiation belt modeling techniques that use the electric and magnetic field outputs from global MHD simulations to drive particle dynamics.
机译：我们调查plasmaspheric影响谐振模式耦合的磁层超低使用的频率(ULF)波磁流体动力(磁流体动力)模型。模型的结果从两个不同的版本,两个由相同的太阳风条件:一个版本,其中包含一个等离子体层(线性调频耦合的大米对流模型,加拉格尔等离子体层模型还包含了),另一个没有(lem)独立。我们发现的感冒,密集等离子体层上有着重大的影响模拟ULF波的性质。等离子体层的夹杂物导致更深(更向地面)压缩的渗透(方位)电场波动,由于波转折点的位置的变化。因此,位置压缩电场振荡共鸣地他们的精力投入到当地环形模场线共振也转变向地面。高频压缩(方位)振荡电场穿透更深低频振荡。压缩波的模式结构模拟与径向站是一致的波振荡模式,特点共振波导。lem全球等离子体层的磁流体动力模型代表了一种进步艺术的状态关于ULF波建模等模拟。对辐射带建模的影响使用电和磁的技术场从全球磁流体动力模拟输出驱动质点动力学。

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