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Remote sensing the plasmasphere, plasmapause, plumes and other features using ground-based magnetometers

机译:使用地面磁力计遥测等离子体,等离子体,羽流和其他特征

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摘要

The plasmapause is a highly dynamic boundary between different magnetospheric particle populations and convection regimes. Some of the most important space weather processes involve wave-particle interactions in this region, but wave properties may also be used to remote sense the plasmasphere and plasmapause, contributing to plasmasphere models. This paper discusses the use of existing ground magnetometer arrays for such remote sensing. Using case studies we illustrate measurement of plasmapause location, shape and movement during storms; refilling of flux tubes within and outside the plasmasphere; storm-time increase in heavy ion concentration near the plasmapause; and detection and mapping of density irregularities near the plasmapause, including drainage plumes, biteouts and bulges. We also use a 2D MHD model of wave propagation through the magnetosphere, incorporating a realistic ionosphere boundary and Alfvén speed profile, to simulate ground array observations of power and cross-phase spectra, hence confirming the signatures of plumes and other density structures.
机译:等离子体暂停是不同磁层粒子数量和对流方式之间的高度动态边界。一些最重要的空间天气过程涉及该区域中的波粒相互作用,但波属性也可用于遥感等离子层和等离子暂停,从而有助于建立等离子层模型。本文讨论了将现有的地面磁力计阵列用于此类遥感。通过案例研究,我们说明了暴风雨期间血浆暂停位置,形状和运动的测量;在等离子体层内外填充通量管;等离子体暂停附近重离子浓度的暴风雨时间增加;并检测并绘制血浆暂停附近密度不规则的图形,包括排水羽,咬伤和凸起。我们还使用了通过磁层的波传播的二维MHD模型,结合了真实的电离层边界和Alfvén速度剖面,以模拟对功率和交叉相位谱的地面观测,从而确认了羽状流和其他密度结构的特征。

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