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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Propagation characteristics of Pi 2 pulsations observed at high- andlow-latitude MAGDAS/CPMN stations: A statistical study
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Propagation characteristics of Pi 2 pulsations observed at high- andlow-latitude MAGDAS/CPMN stations: A statistical study

机译：π2脉冲的传播特征观察到在高- andlow-latitude玛格达/ CPMN电台:统计研究

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摘要

The objective of this study is to understand better the propagation of Pi 2 waves in thenighttime region. We examined Pi 2 oscillations that showed high correlation betweenhigh- and low-latitude Magnetic Data Acquisition System/Circum Pan-PacificMagnetometer Network stations (correlation coefficient: 1-y1 > 0.75). For each horizontalcomponent (H and D) we examined the magnetic local time (MLT) dependence of thedelay time of high-latitude Pi 2 oscillations that corresponds to the highest correlationwith the low-latitude Pi 2 oscillation. We found the delay time of the high-latitude Hshowed remarkable MLT dependence, especially in the premidnight sector: we foundthat in the premidnight sector the high-latitude H oscillation tends to delay from thelow-latitude oscillation (<100 s). On the other hand, the delay, time of the high-latitudeD oscillation was not significant (,±10 s) in the entire nighttime sector. We propose aPi 2 propagation model to explain the observed delay time of high-correlation high-latitude H. The model quantitatively explains the trend of the event distribution. Wealso examined the spatial distribution of high-correlation Pi 2 events relative to thecenter of auroral breakups. It was found that the high-correlation Pi 2 events tend tooccur away from the center of auroral breakups by more than 1.5 MLT. The presentresult suggests that the high-correlation H component Pi 2 oscillations at high latitudeare a manifestation of forced Alfven waves excited by fast magnetosonic waves.
机译：本研究的目的是理解更好的π2波的传播thenighttime地区。振荡显示高相关性betweenhigh,低纬度磁数据采集系统/环Pan-PacificMagnetometer网络电台(相关系数:1-y1 >0.75)。检查磁(MLT)当地时间依赖thedelay高纬度π时间2振动对应于最高correlationwith低纬度π2振荡。高纬度Hshowed非凡的MLT的依赖,尤其是在premidnight行业:我们发现premidnight部门从高纬度H振荡会延迟thelow-latitude振荡(< 100年代)上另一方面,延迟时间的高纬度地区振荡不显著(±10 s)整个夜晚的部门。传播模型来解释观察到的延迟高度相关的高纬度h模型定量解释的趋势事件分布。的分布高度相关π2事件相对于处于中心的极光分手。往往发现高度相关π2事件tooccur远离极光分手的中心超过1.5传输。高度相关的组件π2 H在高latitudeare表现振荡迫使阿尔芬波兴奋的快

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