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Saturation characteristic of electromagnetic ion cyclotron waves

机译:电磁离子回旋波的饱和特性

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摘要

Electromagnetic ion cyclotron (EMIC) waves are an integral component of the Earth's dynamic space environment. In order to quantify their effect, it is necessary to know their saturation amplitude, but in modeling studies it is usually the linear growth rate that is calculated and various assumptions need to be made in order to relate this growth rate to the final amplitude of the wave. Here, we perform a comparison of the saturation characteristics of EMIC waves using a 2.5-D electromagnetic hybrid PIC code, with the corresponding linear growth rates calculated with the hot-plasma dispersion solver of the HOTRAY code. We choose a set of values consistent with satellite observations for our nominal case, and explore the parameter space in the neighborhood of this nominal case, by varying the hot proton density and thermal anisotropy. We find that the saturation amplitudes increase monotonically, and the times to saturation decrease monotonically with increasing growth rates, independent of the values of density and anisotropy. Both the saturation amplitude and time to saturation curves can be fit by simple two-parameter models with acceptable errors. This result implies that within the limitations and caveats of the present study, the saturation amplitudes and time to saturation can be predicted with good accuracy based on the linear growth rates alone, which can be used directly in conjunctions with global ring current simulations to model the resultant effects on magnetospheric particles.
机译:电磁离子回旋加速器(EMIC)波是地球动态空间环境的组成部分。为了量化它们的影响,有必要知道它们的饱和幅度,但是在建模研究中,通常是计算线性增长率,并且需要做出各种假设才能使该增长率与最终的幅度相关。波。在这里,我们使用2.5D电磁混合PIC代码对EMIC波的饱和特性进行了比较,并使用HOTRAY代码的热等离子弥散求解器计算了相应的线性增长率。我们为标称情况选择一组与卫星观测值一致的值,并通过改变热质子密度和热各向异性来探索此标称情况附近的参数空间。我们发现,饱和幅度随密度的增加而单调增加,饱和时间随密度的增加而单调减少,而与密度和各向异性的值无关。可以通过具有可接受误差的简单两参数模型拟合饱和幅度和饱和时间曲线。该结果表明,在本研究的局限性和警告范围内,仅基于线性增长率就可以以较高的精度预测饱和幅度和达到饱和的时间,可以将其直接与全局环流仿真结合使用来建模对磁层颗粒的影响。

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