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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Numerical modeling of electron energy-time dispersions in the high-latitude part of the cusp region
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Numerical modeling of electron energy-time dispersions in the high-latitude part of the cusp region

机译：数值模拟的电子energy-time分散在高纬度尖端的一部分地区

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摘要

We have constructed a one-dimensional numerical model of electron acceleration with dispersive Alfvén waves using realistic parameters based on a rocket observation in the high-latitude part of the cusp region. This paper demonstrates that our model could quantitatively reproduce important characteristics of observed electron energy-time dispersions, such as their fluxes, energy range, pitch angle distribution, and source altitudes. The energy-time dispersion at the rocket altitude is produced by a time-of-flight effect of magnetosheath-originated electrons accelerated by the resonant interaction with inertial Alfvén waves (IAWs) at altitudes of 2000 ～ 6000 km. The higher-energy electrons are generated at higher altitudes. The energy-time dispersion changes according to three key parameters: wave power, perpendicular wavelength, and wave frequency. The wave power affects the flux and the maximum electron energy, and the perpendicular wavelength affects the source altitude calculated by the time-of-flight analysis, while the wave frequency (time period) affects the time width of the energy-time dispersion. We summarize a reasonable set of these parameters for a typical energy-time dispersion observed in the cusp/cleft region. Finally, we suggest that the IAWs are generated at the dayside magnetopause in association with magnetic reconnection and then propagate toward the ionosphere along the open field line connected to the magnetosheath. Their resonant acceleration of local electrons injected from the magnetosheath at altitudes of several thousand kilometers is the cause for multiple electron energy-time dispersions observed in the high-latitude part of the cusp region.
机译：我们已经构建了一个一维数值电子加速与分散的模式阿尔芬波使用基于现实的参数火箭在高纬度地区的部分观察尖端区域。模型可以定量地再现重要观察到电子energy-time的特征分散,如他们的通量,能量范围内,高度螺旋角分布和来源。在火箭高度energy-time色散由飞行时间的影响吗magnetosheath-originated电子加速了与惯性阿尔芬共振交互波(iaw)海拔2000 ~ 6000公里。高能电子生成更高海拔。根据三个关键参数:波浪发电,垂直波长,波的频率。波浪发电影响通量和最大值电子能量,垂直波长影响源高度计算飞行时间分析,波的频率(时间段)影响的时间宽度energy-time分散。为一个典型的energy-time设置这些参数分散在尖端/裂区域。最后,我们建议iaw生成在的光面与磁层磁重联,然后传播方向电离层沿着空旷的田野连接到磁鞘。加速当地电子的注入磁鞘海拔几千公里的原因是多个电子energy-time分散体中观察到高纬度尖端区域的一部分。

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