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首页> 外文期刊>Computer physics communications >A nonuniform nested grid method for simulations of RF induced ionospheric turbulence
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A nonuniform nested grid method for simulations of RF induced ionospheric turbulence

机译：模拟射频感应电离层湍流的非均匀嵌套网格方法

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摘要

We present a numerical scheme to simulate radio-frequency (RF) induced ionospheric turbulence, in which an electromagnetic wave is injected into the overhead ionospheric plasma. At the turning point of the ordinary mode, the electromagnetic wave undergoes linear mode-conversion to electrostatic Langmuir and upper hybrid waves that can have a much shorter wavelength than the electromagnetic wave. In order to resolve both the electromagnetic and electrostatic waves, avoiding severe restrictions on the time step due to the Courant-Friedrich-Lewy (CFL) condition, the equation of motion for the plasma particles is solved on a denser grid than that for the Maxwell equations near the mode-conversion region. An interpolation scheme is employed to calculate the electromagnetic field in the equation of motion of the plasma particles, and an averaging scheme is used to calculate the current density acting as a source in the Maxwell equation. Special care has to be taken to reduce numerical recurrence effects when the wavelength of the electrostatic wave is of the same order or shorter than the coarse grid spacing of the electromagnetic wave. (c) 2007 Elsevier B.V. All rights reserved.
机译：我们提出了一个数值方案来模拟射频（RF）引起的电离层湍流，其中电磁波被注入到顶部电离层等离子体中。在普通模式的转折点，电磁波经历线性模式转换为静电朗缪尔波和上层混合波，后者的波长可能比电磁波短得多。为了解决电磁波和静电波，避免了由于库兰特-弗里德里希-路易（CFL）条件造成的时间步长的严格限制，血浆颗粒的运动方程比麦克斯韦方程组在更密的网格上求解模式转换区域附近的方程。插值方案用于计算等离子体粒子运动方程中的电磁场，平均方案用于计算在麦克斯韦方程中用作源的电流密度。当静电波的波长等于或短于电磁波的粗网格间距时，必须格外小心以减少数值重复效应。 （c）2007 Elsevier B.V.保留所有权利。

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