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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Statistical study of global modes outside the plasmasphere
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Statistical study of global modes outside the plasmasphere

机译：统计研究之外的全球模式等离子体层

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摘要

Global modes, trapped fast mode magnetohydrodynamic (MHD) waves in the Earth's magnetosphere, may exhibit a monochromatic frequency spectrum even in the presence of a driver with a broadband frequency spectrum; they can in turn drive standing Alfvén waves at discrete frequencies via field line resonance (FLR). Direct observations of global modes are limited to a few case studies due to unique challenges associated with detecting them in situ. In this study, we use electric field, magnetic field, and plasma data from multiple THEMIS spacecraft as well as ground-based observations to identify and characterize global modes outside the nominal plasmapause location. We establish a lower bound of 1.0% for the global mode occurrence rate in the 3-20 mHz frequency range in that region and show that global modes occur more frequently during high-speed solar wind intervals. We also show that global modes with frequency between 10 and 20 mHz occur preferentially in the noon local time sector and are likely driven by processes in the ion foreshock. Key PointsThe lower bound for the global mode occurrence rate is 1.0%Global modes occur more frequently near the noon local time sectorThe ion foreshock drives global modes with frequency ≤ 10 mHz
机译：全球模式,被困的快速模式磁流体动力(磁流体动力)波在地球的磁气圈,可能表现出单色即使在的频谱司机与宽带频谱;可以反过来驱动站阿尔芬波通过磁场线共振离散频率(FLR)。局限于少数由于独特的案例研究与检测相关的挑战原地。从多个磁场和等离子体数据THEMIS计划以及地面识别和描述全球观测模式以外的名义等离子体层顶位置。我们建立一个全球的下限为1.0%模式的出现率3兆赫频率在这一地区范围和显示,全球模式更频繁地发生在高速太阳能风的间隔。与10至20 mHz的频率发生当地时间中午行业优先很可能由离子的过程前震。全球模式出现率是1.0%全球模式更频繁地发生在当地时间中午sectorThe离子前震驱动全球模式≤10 mHz频率

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