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Periodic low-frequency electric field structures in a magnetized non-thermal auroral plasma

机译:磁化非热极光等离子体中的周期性低频电场结构

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摘要

The theoretical explanation of electric field structures associated with density depletion in the Earth's upper ionosphere is presented. Using the quasi-neutrality hypothesis, the effect of excess energetic electron species is studied on the evolution of nonlinear low-frequency ion-cyclotron and ion-acoustic waves in a magnetized auroral plasma. The dynamics of the cold ion beam is governed by the fluid equations and the electron is treated as energetic species with non-thermal density distribution. Numerical computations appear in a series of periodic oscillations, such as spiky, sawtooth and sinusoidal waveforms. The present model can generate up to 18 mV/m electric field amplitude, which is in the range of the FREJA satellite measurements in the auroral acceleration region.
机译:提出了与地球上层电离层密度耗尽有关的电场结构的理论解释。使用准中性假设,研究了高能电子物种对磁化极光等离子体中非线性低频离子回旋加速器和离子声波的演化的影响。冷离子束的动力学受流体方程控制,电子被视为具有非热密度分布的高能物质。数值计算出现在一系列周期性振荡中,例如尖峰,锯齿形和正弦波形。本模型可以产生高达18 mV / m的电场幅度,该幅度在极光加速区域的FREJA卫星测量范围内。

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