Kinetic effects in the acceleration of auroral electrons in small scale Alfven waves: A FAST case study
Kinetic effects in the acceleration of auroral electrons in small scale Alfven waves: A FAST case study
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DOI：
10.1029/2002gl015777
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发表时间：
2003-03-21
影响因子：
5.2
通讯作者：
Ergun, RE
中科院分区：
文献类型：
--
作者：
Chaston, CC;Bonnell, JW;Ergun, RE
[1]在这份报告中，我们研究的重要性，离子和电子动力学效应的加速电子在小尺度阿尔芬波以上的极光椭圆。我们实现了一个1-D双流体MHD代码近似的电子惯性和离子和电子温度的影响，以评估它们的作用，占场对齐的电子暴的观察到的能量发现符合这些波以上的极光椭圆形。FAST航天器数据的一个案例研究事件，其特点是大极光离子能量和热等离子体片定义的等离子体通过波传播。据发现，在低于5个地球半径的高度强烈的动力学效应可能显着减少的电子加速可能在波的能量和通量方面的量。
[1] In this report we examine the importance of ion and electron kinetic effects in the acceleration of electrons in small scale Alfven waves above the auroral oval. We implement a 1-D two-fluid MHD code approximating the effects of electron inertia and ion and electron temperatures to evaluate their role in accounting for the observed energies of field-aligned electron bursts found in coincidence with these waves above the auroral oval. FAST spacecraft data for a case study event characterized by large auroral ion energies and a hot plasma sheet is employed to define the plasma through which the wave propagates. It is found that strong kinetic effects at altitudes below 5 Earth radii may significantly reduce the amount of electron acceleration possible in the wave in terms of both energy and flux.