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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Calculating the inductive electric field in the terrestrial magnetosphere
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Calculating the inductive electric field in the terrestrial magnetosphere

机译：计算的感应电场地球磁层

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摘要

This study presents a theoretical approach to calculate the inductive electric field, and it is further applied to global MHD simulations of the magnetosphere. The contribution of the inductive component to the total electric field is found by decomposing the motional electric field into a superposition of an irrotational and a solenoidal vector and assuming that the time-varying magnetic field vanishes on the boundary. We find that a localized change in the magnetic field generates an inductive electric field whose effect extends over all space, meaning that the effect of the inductive electric field is global even if the changes in the magnetic field are localized. Application of this formalism to disturbed times provides strong evidence that during periods of increased activity the electric field induced by the localized change in magnetic field can be comparable to (or larger than) the potential electric fields in certain regions. This induced field exhibits significant spatial and temporal variations, which means that particles that drift into different regions of space are being exposed to different means of acceleration. These results suggest that the inductive electric field could have a substantial contribution to particle energization in the near-Earth region even though the changes in the magnetic fields occur at distances of several tens of Earth radii. This finding is particularly important for ring current modeling which in many cases excludes inductive contributions to the total particle drift.
机译：本研究提出了一种理论方法计算感应电场,它是进一步应用到全球磁流体动力模拟磁气圈。组件总电场是发现的分解动态电场成叠加的无旋和螺线管型的时变向量和假设在边界上磁场消失。局部磁场的变化产生的感应电场影响延伸空间,这意味着感应电场的影响是全球性的即使磁场的变化本地化。提供了强有力的证据,扰乱了倍期间,增加了电活动场诱导的局部磁场的变化字段可以比得上(或超过)在某些地区潜在的电场。这种感应磁场表现出显著的空间和时间变化,这意味着粒子漂移到不同的地区空间被暴露于不同的方式加速度。感应电场可能很大对粒子的激发的贡献近地区域即使的变化磁场发生在距离的几个地球的半径。在许多重要的环电流建模情况下排除归纳贡献总粒子漂移。

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