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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >A comparison of small-scalemagnetic fluctuations in the Region 1 and 2 field-aligned current systems
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A comparison of small-scalemagnetic fluctuations in the Region 1 and 2 field-aligned current systems

机译:比较small-scalemagnetic波动在该地区的1和2 field-aligned电流系统

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摘要

By determining the location and size of the Region 1 (R1) and Region 2 (R2) large-scale field-aligned currents (FACs) from Active Magnetosphere and Planetary Electrodynamics Response Experiment data, we are able to study the small-scale magnetic fluctuations observed by the Swarm satellites embedded within the large-scale FACs. A statistical comparison of R1 and R2 high-frequency fluctuations is presented in terms of different solar wind conditions and geomagnetic activities. We find that (1) the amplitude of high-frequency fluctuations in both R1 and R2 increases as the large-scale R1 and R2 FACs intensify; (2) high-frequency fluctuations in R1 peak near dayside dawn and dusk, while those in R2 peak around noon; (3) the location of the largest high-frequency fluctuations in R1 shifts in local time in response to IMF B_y, indicating a connection between the R1 fluctuation and the driving solar wind most likely explained by magnetic reconnection; and (4) high-frequency fluctuations in R2 are enhanced in a small region near local noon and respond clearly to nightside drivers, as characterized by the auroral electrojet index. Our analysis shows that the intensity of R1 and R2 high-frequency magnetic fluctuations is directly connected to the intensity of FACs, which implies that the magnetic fluctuations are closely related to the magnetospheric processes that drive them.
机译:通过确定的位置和大小1 (R1)和2 (R2)大型区域field-aligned电流(流式细胞仪)活跃磁气圈和行星电动力学响应实验数据,我们能够学习观察到的小规模磁波动蜂群卫星嵌入大规模的流式细胞仪。和R2高频波动在太阳风条件和不同地磁活动。高频波动的振幅R1和R2增加大规模R1和R2流式细胞仪加剧;在R1峰值附近的光面黎明和黄昏,在中午的R2峰值;最大的高频波动R1当地时间的变化在应对国际货币基金组织(IMF)的话,指示R1之间的一个连接波动和驾驶太阳风可能解释了磁重联;(4)高频波动R2加强在当地中午和附近的一个小区域阴面司机反应明显,特点是极光电喷流指数。我们的分析表明,R1和强度R2高频磁场波动直接连接到流式细胞仪的强度,这意味着磁场波动吗磁性层的过程密切相关驱动。

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