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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Ionospheric Plasma Irregularities Characterized by the Swarm Satellites: Statistics at High Latitudes
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Ionospheric Plasma Irregularities Characterized by the Swarm Satellites: Statistics at High Latitudes

机译：电离层等离子体违规行为的特征群卫星:统计在高纬度

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摘要

The polar ionosphere is often characterized by irregularities and fluctuations in the plasma density. We present a statistical study of ionospheric plasma irregularities based on the observations from the European Space Agency's Swarm mission. The in situ electron density obtained with the Langmuir probe and the total electron content from the onboard global positioning system receiver are used to detect ionospheric plasma irregularities. We derive the irregularity parameters from the electron density in terms of the rate of change of density index and electron density gradients. We also use the rate of change of total electron content index as the irregularity parameter based on the global positioning system data. The background electron density and plasma irregularities are closely controlled by the Earth's magnetic field, with averaged enhancements close to the magnetic poles. The climatological maps in magnetic latitude/magnetic local time coordinates show predominant plasma irregularities near the dayside cusp, polar cap, and nightside auroral oval. These irregularities may be associated with large-scale plasma structures such as polar cap patches, auroral blobs, auroral particle precipitation, and the equatorward wall of the ionospheric trough. The spatial distributions of irregularities depend on the interplanetary magnetic field (IMF). By filtering the irregularity parameters according to IMF B_y, we find a clear asymmetry of the spatial distribution in the cusp and polar cap between the Northern (NH) and Southern Hemispheres (SH). For negative IMF B_y, irregularities are stronger in the dusk (dawn) sector in the NH (SH) and vice versa. This feature is in agreement with the high-latitude ionospheric convection pattern that is regulated by the IMF B_y component. The plasma irregularities are also controlled by the solar activity within the current declining solar cycle. The irregularities in the SH polar cap show a seasonal variation with higher values from S
机译：极地电离层通常的特征违规行为和等离子体波动密度。电离层等离子体违规行为的基础上从欧洲太空总署的观察群的使命。用朗缪尔探针和总从全球机载电子内容定位系统接收机用于检测电离层等离子体违规行为。从电子密度不规则参数的密度指数的变化率和电子密度梯度。总电子含量指数的变化率基于全球不规则参数定位系统数据。密度和等离子违规行为是紧密地球的磁场控制的平均磁增强近波兰人。当地时间纬度/磁坐标显示主要的等离子体附近的违规行为极地冰冠的光面尖端,阴面极光椭圆形。大型等离子体结构如极地冰冠补丁,极光blob、极光粒子降水,朝赤道方向的墙电离层槽。违规行为依赖于星际磁场(IMF)。不规则参数根据国际货币基金组织(IMF)的话,我们找到一个明确的不对称的空间分布之间的尖端和极地冰冠北方(NH)和南半球(SH)。-国际货币基金组织(IMF)的话,违规行为更强在黄昏(黎明)部门在NH (SH)和副。高纬度地区电离层对流模式的话是由国际货币基金组织(IMF)组件。违规行为也控制的太阳能活动在当前太阳能下降周期。表现出较高的季节性变化值年代

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