Method for direct detection of pitch angle scattering of energetic electrons caused by whistler-mode chorus emissions
Method for direct detection of pitch angle scattering of energetic electrons caused by whistler-mode chorus emissions
复制标题
直接检测哨声模式合唱发射引起的高能电子俯仰角散射的方法
DOI：
10.1002/2015ja021902
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
and Y. Katoh
中科院分区：
文献类型：
--
作者：
Kitahara;M.;and Y. Katoh
波粒相互作用分析仪（WPIA）是由Fukuhara等人（2009）提出的一种新仪器，它测量波磁场矢量和每个粒子的速度矢量之间的相对相位角，并计算从波到粒子的能量交换。在这项研究中，我们提出了一种方法，使用WPIA直接检测的俯仰角散射的共振粒子的等离子体波通过计算g值的扩展其适用性。g值被定义为作用在每个粒子上的洛仑兹力的累积值，并表示波的动量损失。我们将所提出的方法应用于一维电子混合模拟的结果，再现了磁赤道周围哨声模式合唱发射的产生。利用模拟系统中假设的固定观测点获得的波和粒子数据，使用WPIA对模拟结果进行伪观测，并分析g值。我们的分析产生了显着的值，表明强俯仰角散射的动能和俯仰角范围内的电子满足回旋共振条件与再现合唱排放。本研究的结果表明，所提出的方法使我们能够直接和定量地确定俯仰角散射发生在仿真系统中的位置，并且该方法可以应用于即将到来的地球空间探测和辐射（ERG）卫星的天基观测结果。
The Wave‐Particle Interaction Analyzer (WPIA), a new instrument proposed by Fukuhara et al. (2009), measures the relative phase angle between the wave magnetic field vector and the velocity vector of each particle and calculates the energy exchange from waves to particles. In this study, we expand its applicability by proposing a method of using the WPIA to directly detect pitch angle scattering of resonant particles by plasma waves by calculating thegvalues. Thegvalue is defined as the accumulation value of the Lorentz force acting on each particle and indicates the lost momentum of waves. We apply the proposed method to the results of a one‐dimensional electron hybrid simulation reproducing the generation of whistler mode chorus emissions around the magnetic equator. Using the wave and particle data obtained at fixed observation points assumed in the simulation system, we conduct a pseudo‐observation of the simulation result using the WPIA and analyze thegvalues. Our analysis yielded significant values indicating the strong pitch angle scattering for electrons in the kinetic energy and pitch angle ranges satisfying the cyclotron resonance condition with the reproduced chorus emissions. The results of this study demonstrate that the proposed method enables us to directly and quantitatively identify the location at which pitch angle scattering occurs in the simulation system and that the method can be applied to the results of space‐based observations by the forthcoming Exploration of energization and Radiation in Geospace (ERG) satellite.