Electron acceleration in the magnetosphere by whistler-mode waves of varying frequency
Electron acceleration in the magnetosphere by whistler-mode waves of varying frequency
复制标题
不同频率的哨声模式波在磁层中的电子加速
DOI：
10.1134/s0016793206060053
复制
发表时间：
2006
影响因子：
0.6
通讯作者：
D. Nunn
中科院分区：
文献类型：
--
作者：
A. Demekhov;V. Trakhtengerts;M. Rycroft;D. Nunn
本文研究了非均匀地磁场中相对论电子与纵向传播的不同频率哨声波共振相互作用时的加速问题。研究了被波场俘获的电子加速的具体特征。以前的估计，这种加速的效率已被推广到相对论效应方面，并在广泛的初始能量范围内的能量增益的简单公式已经获得。已经表明，在电子和哨声模式波包之间的单个相互作用期间的能量增益，具有地球磁层中合唱发射元素的典型参数，可以达到几keV。讨论了这种加速机制实现的条件。具体来说，人们发现，在地球磁层中的合唱发射的情况下，这种机制对于垂直能量是产生合唱的电子能量的几倍的电子来说是有效的。
Acceleration of relativistic electrons in an inhomogeneous geomagnetic field during their resonant interaction with longitudinally propagating whistler-mode waves of varying frequency has been considered. Specific features of acceleration of electrons trapped by the wave field have been studied. Previous estimates of the efficiency of such acceleration have been generalized with regard to relativistic effects, and the simple formula for energy gain in a wide range of initial energies has been obtained. It has been indicated that the energy gain during a single interaction between electron and a whistler-mode wave packet, with typical parameters of an element of chorus emissions in the Earth’s magnetosphere, can reach several keV. The conditions of this acceleration mechanism realization are discussed. Specifically, it has been found that, in the case of chorus emissions in the Earth’s magnetosphere, this mechanism can be effective for electrons with perpendicular energies several times as high as such an energy of electrons generating chorus.