Computer simulations for direct conversion of the HF electromagnetic wave into the upper hybrid wave in ionospheric heating experiments
Computer simulations for direct conversion of the HF electromagnetic wave into the upper hybrid wave in ionospheric heating experiments
复制标题
电离层加热实验中高频电磁波直接转换为上层混合波的计算机模拟
DOI：
10.1007/s00585-998-1251-y
复制
发表时间：
1998
影响因子：
1.9
通讯作者：
H. Matsumoto
中科院分区：
文献类型：
--
作者：
H. Ueda;Y. Omura;H. Matsumoto
与电离层加热实验相关的上层混合波的激发被认为对于解释受激电磁发射（SEE）的一些特征至关重要。提出了直接转换过程作为上部混合波的激励机制，其中由于小尺度密度不规则性，倾斜传播的电磁泵浦波的能量被转换为静电上部混合波。我们进行了电磁粒子在细胞中的模拟，以研究电离层加热实验中的能量转换过程。我们研究了激发波的振幅对泵浦波的传播角、密度不规则性的尺度长度、不规则性的程度以及等离子体的热速度的依赖性。在最佳条件下，最大振幅为泵浦振幅的37。关键词：电离层（电离层不规则性；等离子体波和不稳定性；波粒相互作用）。
Excitation of upper hybrid waves associated with the ionospheric heating experiments is assumed to be essential in explaining some of the features of stimulated electromagnetic emissions (SEE). A direct conversion process is proposed as an excitation mechanism of the upper hybrid waves where the energy of an obliquely propagating electromagnetic pump wave is converted into the electrostatic upper hybrid waves due to small-scale density irregularities. We performed electromagnetic particle-in-cell simulations to investigate the energy conversion process in the ionospheric heating experiments. We studied dependence of the amplitude of the excited wave on the propagation angle of the pump wave, scale length of the density irregularity, degree of the irregularity, and thermal velocity of the plasma. The maximum amplitude is found to be 37 of the pump amplitude under an optimum condition.Key words.Ionosphere (ionospheric irregularities; plasma waves and instabilities; wave-particle interactions).