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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Dynamics of high-energy electrons interacting with whistler mode chorus emissions in the magnetosphere
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Dynamics of high-energy electrons interacting with whistler mode chorus emissions in the magnetosphere

机译：高能电子相互作用的动力学方程惠斯勒合唱排放的方式磁气圈

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摘要

Close examination of whistler mode chorus emissions reveals that a chorus emission is a coherent monochromatic wave typically with a fast rising tone. The frequency of the emission increases rapidly along with growth of the wave amplitude. We first consider the generation mechanism of whistler mode chorus emissions. The essential mechanism of the frequency change is critically related to the inhomogeneity of the geomagnetic field in the equatorial region. The rising tone emission is only possible when the coherent wave propagates away from the equator interacting with a sufficient flux of counterstreaming resonant electrons. Depletion of the resonant trapped electrons from the wave phase space results in formation of an electromagnetic electron hole, which gives rise to a transverse resonant current causing both wave growth and frequency increase. The wave growth of a rising tone can elongate the nonlinear trapping zone, which works as an effective wave train that guides a fraction of the resonant electrons moving toward the equator. We perform test particle simulations where we solve the relativistic equations of motion for high-energy electrons under the action of the electromagnetic field of a coherent whistler mode wave and the assumed dipole geomagnetic field. We find that a fraction of weakly relativistic electrons are trapped by a coherent wave and that the trapped electrons are effectively accelerated by the chorus wave with a rising tone.
机译：仔细检查惠斯勒模式合唱显示,合唱发射是排放相干单色波通常用一个快升调。随着增长的浪潮迅速增加振幅。惠斯勒的机理模式合唱排放。频率变化的重要机制极度的不均匀性有关在赤道地区地磁场。阳平排放时唯一的可能远离赤道的相干波传播与足够通量的交互逆流共振电子。从波共振捕获的电子相空间形成的结果产生的电磁电子空穴横向谐振电流造成波增长和频率增加。阳平可以伸长的增长非线性捕获区,这是一个有效的波列,指导的一小部分共振电子向赤道。我们执行测试粒子模拟解决的相对运动方程高能电子的作用下电磁场的一个连贯的惠斯勒模式波和假定的偶极磁场。发现弱相对论的一小部分电子相干波,被困被困电子有效地加速合唱的波与崛起的基调。

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