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3D PiC code investigations of Auroral Kilometric Radiation mechanisms

机译：三维公斤辐射机制的图形代码研究

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Efficient (~1%) electron cyclotron radio emissions are known to originate in the X mode from regions of locally depleted plasma in the Earths polar magnetosphere. These emissions are commonly referred to as the Auroral Kilometric Radiation (AKR). AKR occurs naturally in these polar regions where electrons are accelerated by electric fields into the increasing planetary magnetic dipole. Here conservation of the magnetic moment converts axial to rotational momentum forming a horseshoe distribution in velocity phase space. This distribution is unstable to cyclotron emission with radiation emitted in the X-mode. Initial studies were conducted in the form of 2D PiC code simulations [1] and a scaled laboratory experiment that was constructed to reproduce the mechanism of AKR. As studies progressed, 3D PiC code simulations were conducted to enable complete investigation of the complex interaction dimensions. A maximum efficiency of 1.25% is predicted from these simulations in the same mode and frequency as measured in the experiment. This is also consistent with geophysical observations and the predictions of theory.
机译：已知有效（〜1％）电子回流式无线电发射来源自地球极性磁层中局部耗尽等离子体区域的X模式。这些排放通常被称为极光公里辐射（AKR）。 AKR自然地发生在这些极性区域中，其中电子通过电场加速到增加的行星磁性偶极子中。这里，磁矩的保护转换为在速度相空间中形成马蹄形分布的旋转动量。该分布对于在X-Mode中发射的辐射发射不稳定。以2D PIC代码模拟[1]的形式进行初始研究以及构建以再现AKR机制的缩放实验室实验。随着研究进展，进行了3​​D图片代码模拟，以便能够完全调查复杂的相互作用尺寸。在实验中测量的相同模式和频率，这些模拟预测了1.25％的最大效率。这也与地球物理观察和理论的预测一致。

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