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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Experimental evidence of drift compressional waves in themagnetosphere: An Ekaterinburg coherent decameter radar case study
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Experimental evidence of drift compressional waves in themagnetosphere: An Ekaterinburg coherent decameter radar case study

机译：漂移压缩波的实验证据在themagnetosphere:叶卡捷琳堡连贯十米雷达案例研究

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摘要

A case study of shortwave radar observations of magnetospheric Pc5 ULF waves (wave periods of 150–600 s) that occurred on 26 December 2014 in the nightside magnetosphere during substorm activity is presented. The radar study of waves in the magnetosphere is based on analysis of scattering from field-aligned irregularities of the ionospheric F layer. Variations of their E × B drift velocity at F layer heights are associated with the wave electric field. Analysis of the observations from the Ekaterinburg (EKB) radar shows that the frequency f of the observed wave depends on the azimuthal wave number m (positive correlation of about 0.90): an increase in frequency from 2.5 to 5 mHz corresponds to increased m number from 20 to 80. Of the known types of waves in the magnetosphere corresponding to the Pc5 range, only drift compressional waves have such azimuthal dispersion: the frequency of the drift compressional mode is directly proportional to the azimuthal wave number and the gradient-curvature drift velocity of energetic particles in the magnetic field. This wave has a kinetic nature and represents the most common kind of the compressional modes, demanding for its existence only finite pressure and plasma inhomogeneity across magnetic shells.
机译：一个案例研究的短波雷达观测的磁性层的Pc5 ULF波(波的时期150 - 600年)2014年12月26日发生的阴面的磁层亚暴活动了。磁气圈的分析的基础上散射field-aligned违规行为的电离层F层。B在电离层高度漂移速度与波电场有关。从叶卡捷琳堡的观察(EKB)雷达显示的频率f波取决于方位波数米(约0.90)的正相关:一个增加从2.5到5 mHz对应的频率m数量从20增加到80。波的类型相对应的磁气圈Pc5范围,只有漂移压缩波有这样的方位色散:的频率直接压缩模式角波数和成比例gradient-curvature漂移速度的精力充沛粒子在磁场中。动力学性质和代表最常见压缩模式的要求它的存在只有有限的压力和等离子体在磁性壳不均匀性。

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